Trust me, I'm the last person who'll want to censor something because it 'offends' people.
That said, if I was the DC editor who had to sign off on it, I'd probably think a hundred times before doing that. Because ultimately, leaving aside politics and free-speech issues, I have a responsibility to the company and to these characters I've been entrusted with. And given the divisive political discource in the US right now, of which the Jan 6 riots are a major feature, I'd probably want to keep any association with that away from a book I'm responsible for right now, to avoid the controversy and hassle more than anything else.
I could understand making Wild Dog part of some fictitious right-wing militia, or just present him as a straightforward conservative and libertarian (God knows, if Ben Percy can have Oliver Queen literally call himself a ''social justice warrior'', another writer should be allowed to present a right-leaning character in a semi-positive light at least). But invoking Jan 6 is just an ill-advised move right now in so many ways, and it'll probably be more trouble than its worth.
Well, not everyone in the US would agree that the Capitol rioters are the same as a 9/11 hijacker. But that's the point...it's too contentious and too recent an event to start incorporating into pop-culture in a throwaway manner like this just to look, as you say, ''relevant''.