He does have a point, however, ToudenkiHou is something lightning blaster, and KimaguLaser is Wonderous Laser, like how wonderous atlantis is, the place where the fictional material Orichalcum originated in. So I believe that KL is Koraidon, and TH is Miraidon, based on how Miraidons Violet dex entry mentions i, quote,
Violet | This seems to be the Iron Serpent mentioned in an old book. The Iron Serpent is said to have turned the land to ash with its lightning. |
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So yeah, I believe that Light just made a little mistake, it's alright, we're only human, after all.