Are you unwilling to even consider the possibility that Palmer is actually a libertarian, and holds beliefs consistent with mainstream libertarian positions? The 'evidence' in that article includes him liking posts on Twitter indicating he probably dislikes Hillary Clinton (something he would have in common with virtually all libertarians), supports Wikileaks (again, pretty common among libertarians), and that he frequently likes tweets/retweets from his girlfriend (common among virtually all young adults in CURRENT_YEAR who like being in a relationship).
It's pretty flimsy stuff, but presumably all the author could find to prop up the main bit, that Palmer donated to a non-profit with roots on T_D (which, obviously, is a cesspool) that…never seemed to do much of anything as far as I can tell.
I'm not "surprised" people call him a Trump supporter as a consequence, people say all kinds of dumb and unfounded things every day. I'm asking you to provide evidence for the assertion you made, or perhaps to reflect on why you (and seemingly everyone else in our culture) are so quick to label anyone with whom you have any difference in ideology as THE BIG BAD OTHER.