I can accept a backwards step from outright calling him a fully-fledged fascist, but:
“post-truth is pre-fascism and Trump has been our post-truth president”
The problem is, if you don't speak about things in sufficiently stark terms people don't act. And then, if enough time passes, when you do talk about them in stark terms because people have become acclimatized to the "warnings", they think that the newer, starker warnings are overblown. Look at how little has been done in response to the alarm that climate scientists have been sounding since at least the 70s. Then look at the fact that despite Trump's negligent response to CoronaVirus and his failure to achieve the vast majority of what he set out to achieve, he still accrued one of the largest vote tallies in American electoral history.