RU was never good at shedding its bad mons from its tier list, the RU ladder has always been absolutely terrible and uses mons that shouldn't be RU. This was the case even in BW RU when terrible mons like Dusknoir, Sandslash, and Electivire were RU (and they were really horrible), while good mons like Alomomola, Golurk, Roselia, and Scolipede were down in NU, among many other good mons that deserved RU. BW RU also has a long history of poor usage stats that were never an accurate representation of the metagame (Claydol was even #1 in usage when it was RU last gen lol). Apparently RU's poor ladder problems continued into XY RU, that is why we still have really bad mons in RU like Ambipom, Claydol, and Hitmonchan. Incidentally, this is like BW UU all over again, only without Dusclops.
Oh and welcome back to OU Magnezone.