Is there any reason to take this person seriously? At least with the Mii Costume guy (who, among other things, said that Goemon, Zero, Protoman, and Team Rocket Grunt would be part of the same Mii costume pack, which is way too specific to be a coincidence even if they didn't mention Sans), Shinobi, or Vergeben (for Smash, at least; his history with other games seems spottier), there's a track record to go on. As for this user, the only things that I can recall that they've gotten right were piggy-backed off of other, more reputable sources, (ex. saying that there would be a Direct of some kind on July 20th, after two or three people on ResetEra hinted the same thing beforehand) unless there's something that I've forgotten. (I don't pay close attention to leakers)