Well this was an interesting read. Man, Gojo is having just the longest day.
I feel like I've read about 40k having a necron tech containment unit meant for sealing, well, C'tan, that would probably do a pretty good imitation of the prison Gojo came out of. I bet there's plenty of other things in 40k that could cause him problems. Orks have a gun that teleports the bullet inside its target iirc. Might run into a range limit of some kind with infinity though. Honestly, most of my Gojo counters I can think of go back to necron tech fuckery. Aeldari probably have some ridiculous nonsense that could hurt him too. I'm not sure what the imperium could do. I suppose throw a Blank at him? Not sure how that would interact with him.