He watches the documentaries about Nazis and World War II though. Enough people have commented on that favorite pastime of his to indicate it's probably true. And shark week.
None of this means anything. It may mean he’s keenly interested in the details about Hitler, or that he’s curious what made him so popular, or what kinds of things he pulled.
Of course that may indicate he wants to copy them, but he may just be interested and possibly want to avoid such things.
Know your enemy, you know.
My sister read Mein Kampf. It is available in print. She read it during high school and the admin brought her in on exactly this kind of hyper concern over her proclivities. She simply wished to read history and understand background of various things. What makes these people tick.
We also have many copies of Communist Manifesto in our houses and Das Kapital. We are not communists.
That said, yes, Trump certainly might have proclivities. But this is not the sole evidence to prove anything.