Yes, I suspect (as another commenter said) that these might be phrases that have been used in some 'political spamming' campaign flooding youtube with hundreds

Yes, I suspect (as another commenter said) that these might be phrases that have been used in some 'political spamming' campaign flooding youtube with hundreds of thousands of OT comments on random videos. So they might have been treated as garbage and deleted. I can understand that if every youtube video starts to be spammed with "Trump sucks" comments, Youtube might decide to auto-delete them. It doesn't have to be pro-Trump censorship.