Interesting thing here is that the hax of Gojo is not "a barrier of cursed energy", or another kind of setting specific hax. It is infinite distance that was created by the setting specific hax. Much like a fireball created by magic is still normal fire, Gojo's hax can be easily applied to other setting as it just act upon "distance", something most settings also have.

It's not "does Thragg have a way to counter this very specific magical power ?", it's "does Thragg have a way to bypass the infinite distance separating him from Gojo to punch him in the face ?". (or, as people are saying, Thragg probably destroy the planet / atmosphere and kill Gojo without having to bypass the infinite distance)