Game Freak are known to call Base Stats and EV's the exact same thing, look at the EV reducing berry descriptions, they talk about lowering the base Stat to remove the EVs. Kiso Points are EV's which is what the japanese call them like someone said above. Please do not panic about this.I don't know where the huge paragraph about S.T. on Serebii came from but they need to rework it because they use the term "base stats" repeatedly which comes way before EVs even matter.
Not to mention "the underlying value that define HP, Attack, Defense, Sp. Atk, Sp. Def, and Speed stats" is exactly what an actual "base stat" does. The way this is worded absolutely does not sound like EV's at all. I'm hoping its poor grammar/improper usage because if it's not then we've got something way way way bigger than Megalutions to worry about.
Its pretty much better EV training, which is much better than before. I was never a fan of grinding a lot against the same Pokemon to get an increase in that stat lol... All these nice little improvements will be great overall I think. Although, I know everyone will now get good EV's right away on all their mons and force their way through the game :P