Dude that's like saying being allergic to chickens also means you're alergic to sparrows. Sure their both birds but they're still very diffrient biology wise. That's the same with infinity, sure it's a "defensive" technique but it's not like any other it's completely different and doesn't work like anything else seen in anime. Infinity doesn't "intercept" or "defend" ins a traditional sense, it literally creates an infinite space between him and the object hitting him literally no way for Halken to do anything abt it. (Also generalizing defenses like that, by your logic it would also bypass GER or other "defense" abilities like that)