Neither does Bison, in SF6 you don't need an invincible reversal to be top tier. What usually tempers zangief in other games is even though hes mid or low tier, he dominated half of the cast and loses to the other half. In this game he beats Cammy and Bison. He is 5/5 with Ken and Akuma. He loses to Ed and Rashid. He Dumpsters the rest of the cast he'll see. He loses to Sim and Lily who are non existent in tournaments, and JP is almost with those 2.
in Sf6, the incincible reversal is only necessary for when you're cornered. Gief never gets cornered. He walks you down not the other way around.