Also, what's that have to do with RTZ? Whether it does or doesn't wouldn't have any effect on what RTZ does or what it can do.
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First off "I Can't See Diavolo Erasing Spacetime." That means nothing, that in itself is fallacious as all hell.
Second off. Nothing exists in time skip except Diavolo, not only is that why he can't just punch holes through dudes and has to wait for time to resume to do so (and also why he can't be harmed and attacks just phase through him, they aren't actually there, they're just forecasted images), it's kind of why everything crumbles away and vanishes. Everything in the world ceases to be, it doesn't exist because space doesn't exist because time doesn't exist, nothing but him does.
Ignoring the fact that anime isn't the main canon, what anti-feat? Surely you don't mean the wacky background that in the manga is conveyed as nothing but a blank background?