They're cut from from the Enoch Powell, Goebbels playbook - it's not name calling when it's simple factual description of the source material in question.
This isn't some US Democratic smear at all, Miller is regarded as a far right extremist and outlier by Republicans (eg: https://www.salon.com/2018/01/21/lindsey-graham-slams-stephe...)
Call a spade a spade.
"To be fair" wrt Donald Trump, in my opinion the Generals were bang on describing him as a Fascist but he's nowhere near the level of being an actual Nazi that, say, his father actually was.
He's primarily a self serving opportunist and a supremely talented and natural grifter, the people to really worry about will be his his appointments in this coming term - they'll have their own agenda's and will have relatively free reign to pursue them as long as they are loyal to Trump (in his opinion).