I mean, I've always loved Mewtwo so I'm okay with more favourism I guess, genuinely surprised that we're getting two different ones but it makes sense. Armoured Mewtwo (Sword) and Armoured Mewtwo (Shield) are perfect ways to highlight the new mechanic while also giving us some exciting version exclusives. Literally just X and Y again, but that worked out last time anyways.
I definitely think it's real, but I also want it to be real so there's that lol.
But we should note that Mewtwo with his armour is actually a pretty popular ask. When we got the Megas, I remember a common sentiment was that Mewtwo with his classic anime armour would've been cooler than X and Y. People still ask for the armour in Smash, although that's not too common. When the new Mewtwo movie was announced, there was a lot of speculation about armour coming back, as well. It wouldn't be to hard to guess, since I've even predicted it myself, just not as an evolution/new mechanic.