They linked this page again for the Mewtwo raid and I noticed it got a lot of minor updates since then (
archive for reference). It's kind of interesting what they changed so I will detail all the differences here.
A paragraph was corrected to mention that the 2-4 star raids are unlocked by obtaining specifically Gym Badges and not just any badges.
This Umbreon moveset image is completely different (left: new, right: old). The Umbreon now has Snarl over Screech, is in a Poke Ball instead of a Dusk Ball, is male instead of female, seems to have non-maxed EVs and a neutral nature, and the Y button info at the bottom has changed so that might be taken on a different patch.
The raid example shows a 5* Hatterene with Gengar instead of the Marill image from prerelease.
The current page has whole new sections for "Abilities" and "Held Items" and shows the same Umbreon. It explains about Ability Capsules and Patches as well with an example of Azumarill.
While a Pokémon’s Ability is important, it isn’t set in stone. Ability Capsules and Ability Patches allow a Pokémon you’ve already trained to switch its current Ability to another Ability its species can have. So, if you caught an Azumarill with great offensive stats but its Ability is Thick Fat, you could still maximize its damage output by using an Ability Capsule to change its Ability to Huge Power. Or, if your Azumarill is struggling to withstand a powerful Tera Pokémon’s Grass-type attacks, you could use an Ability Patch to switch its current Ability to a rare one—in this case, the abovementioned Sap Sipper. Ability Capsules can be purchased at Delibird Presents and Ability Patches can be earned by completing 5- or 6-star Tera Raid Battles.
Choosing the right item for your Pokémon to hold is another way to prepare for the ups and downs of a difficult Tera Raid Battle. Punching Gloves, Muscle Bands, and other attack-oriented items are a great fit for hard-hitting Pokémon such as Iron Hands, while Umbreon and other supportive Pokémon will benefit more from defensive items such as Light Clay or Sitrus Berries. Held items can be found throughout your adventures or bought at a Delibird Presents, each of which offers a different selection of items for sale. When in doubt, consider the role you want your Pokémon to play in battle and which held items are most likely to help achieve that goal.
I feel like suggesting Punching Glove and Muscle Band is just bad advice here and unfortunately this advice carries over later on in the example sets.
Another new section is the "Terastallizing" section and this one is actually pretty good info for players.
After a reaching a certain threshold, Tera Pokémon encountered in 3- to 7-star Tera Raid Battles will activate a Tera Shield that reduces all damage received and negates the effects of status moves. This shield can be broken with enough regular attack damage, but your Pokémon’s moves will be much more effective if it’s Terastallized. Once you’ve landed three attacks and activated your Tera Orb, remember to select moves that match your Pokémon’s Tera Type—there’s no better way to damage a Tera Shield!
Telling people that moves do more damage when tera'd and with a matching type is good info that should have been out there from the start.
In the Recommended Pokemon section, Iron Hands is now mentioned and has replaced Perrserker, and Toxapex is here too.
The movesets section has been revamped with abilities, held items, images, and types listed for all mons.
Azumarill stays the same and adds on Shell Bell and Huge Power to make sure you get the point. I'm not a fan of having Superpower here but it's relatively inoffensive.
The Umbreon set is made consistent with the previous screenshots.
Blissey loses Reflect for Helping Hand but keeps the Light Clay.
Garchomp is the same but gains Sitrus Berry and Sand Veil for some reason. This is the beginning of some questionable choices.
Toxapex and Iron Hands are new additions to replace Perrserker for good, and I have no idea what they were thinking here. Poison Barb and Punching Glove? Toxapex should be running Leftovers and Iron Hands has so many better options like Scope Lens or Big Root or really anything more than a 10% boost. At least the sets are fine but they never really touch on Toxapex's power of debuffs in the actual article, especially how the debuffs can bypass the shield.
Koraidon's set is the same but Miraidon takes Calm Mind over Taunt and pokemon.com suggests generic type boosting items. Personally I would at least suggested the Heat Rock or Terrain Extender for a generic helper option, or even just repeat Shell Bell. Miraidon should really consider the Throat Spray set though.
Lastly, the final screenshot shows the same Hatterene with Gengar to be consistent, while the original showed a random Cetitan and spoiled Iron Hands in the background.
Overall the new version has more details but I feel it could still be improved. I'm glad the pokemon.com team is out here improving old articles if they're going to try to help people out though.