Frankly because a lot of people here on HN buy the new regime's claims fully, and refuse to take a skeptical look at what is happening. They don't want political news on here because they have chosen to get political news only from a few select/deified "truth" channels and anything else is a lie. They don't want their carefully curated filter bubble to be threatened.
I was here when HN tried "no politics" and clearly demonstrated how stupid and foolish that is even as a concept. You don't get to play "I just want to talk tech and be apolitical" when those titans of "tech" are swearing fealty to the regime and choosing to lose slam dunk cases as a means of bribing the president.