I mean, Kamala is not a communist...and Trump is the only president who tried to overthrow election results because he lost...that does sound like a threat to democracy...
Also, I don't think calling Harris a communist is going to be as impactful as the right seems to believe. There are so many people who really don't know what communism is....or, they know this is a baseless smear and it will have no impact.
I honestly wonder who Trump is campaigning for. I mean, he has his millions of true believers who will vote for him regardless of what he says or does, because they are basically cuck voters....But, his bullshit probably isn't winning him too many new people or swaying the undecided.