They said it consistently since the start of S1, even while Grimzzz was winning tournaments. And it has been one of those “given” things that was just accepted by the community.
To be fair, just because Thompxson wins doesn’t mean Jago is top tier or OP. But it is the definition of “viable.”
But it goes to show that “the community” can be collectively wrong - and VERY wrong about the game. If you needed more evidence than the initial reception for Kan Ra (too weak), Fulgore (too weak), Cinder (OP), Kim Wu (not viable) etc. Fulgore is my favorite because he has been nerfed over and over since his introduction and every time “the community” responds by telling the devs they are crazy and don’t understand their own game and after all “if Fulgore is so OP how come no one is winning with him?” Then, IMMEDIATELY, like literally seconds after someone shows up with a Fulgore that wins they start crying for more nerfs - using the same argument, that the devs don’t understand their own game and just need to listen to the wisdom of “the community.” SMH