Here's a counterpoint; AT programming is finicky to work with, just look at the
rod glitch incident.
Hell, even adapting
's blocks for every stage at all still resulted in some severe glitches to fix, so I don't think they'd feel the need to go to that much trouble to tweak increasingly-older code for ATs when effort can be saved for other things (like using actual fighters as bases for DLC).
Of course, there's still the possibility that the staff
can get over that, but it simply isn't in their priorities and want to promote whatever might be the more surprising choices to go with. Old habits die hard like that.
Again, Activision-related things being accidentally or intentionally leaked is nothing new, if it means anything.
Like the Nitro-Fueled datamines going on for so long that the staffers eventually caught on and decided to just troll everyone with the final secret character.
Like the Crash 4 concept art floating around until the artbook was eventually announced, as well as the one legitimate leak that talked about playable Cortex and multiple masks.
Like the Tony Hawk remakes being such a worse-kept secret that even a rapper openly blabbed about them.
If there's one thing we can count on, it's someone somewhere in the West having let their hand slip. If this is a legitimate "leak", at least this could easily be written off as no different than Koei Tecmo retweeting a spirit event.