Psychosis refers to a mental state characterised by hallucinations and paranoid delusions. Are you saying Trump hears voices in his head he thinks are real?
his constant professing of what "people" "say" "to him", especially particularly absurd things that there is no evidence anyone has ever said to him, would also technically meet the definition of him hearing voices - IF he is not lying. Which, to be fair, he could be, because he lies about a lot of shit all the time.
Impossible to rule out. Looks like a duck, quacks like a duck, swims like a duck. I'm not ornithologist but heuristically speaking treating the proverbial duck-like phenomenon as though it is a duck coincides with a statistically high probability of ideal results.
I don't think Trump's delusions are paranoid. In fact, he's remarkably unbothered given the very real dangers he faces. If he suffers from delusions, I would say they're the opposite - confident delusions.