just because the words “what about…” are used, doesn’t make an argument a whataboutism.

a whataboutism deflects from an argument or aims to derail an argument.

what the previous user did was ask for further argumentation about a directly related topic; it’s a continuation, not a deflection.

so it’s not fallacious, buta legitimate question:

you’ve banned some propaganda channels (argument is closed at this point), will you now also ban other, similar channels (new, related argument)?

since the previous argument has concluded, because yt has already enforced their views, wether right or wrong, the follow-up question is perfectly legitimate.

Whataboutism is often legit, though, as in this case.