If you were saying Trump is a post-turtle, I'd agree with that. (Turtle on a post: he doesn't know why he's up there; and he didn't put himself there.)
Other people chose him as their front man because he's a narcissistic, amoral crowd-pleaser who craves adulation.
But yes, rightwing billionaires like the Mercers bankrolled the 2016 campaign and dictated who some of the staff would be. They understood the usefulness of Cambridge Analytica and Facebook, because Robert Mercer is a techie himself.
Putin also had a crack at getting Trump in. How much effect Russian interventions in the 2016 election had is debated, but the fact of their intervention isn't (well, not by anyone who's seen the evidence at the hearings).
It would be very strange indeed if those players had simply gone home after 2016. Clearly white supremacist groups existed before 2016, too, and we've seen them come out to play. The disruption of US democracy very obviously benefits hostile states, so it would be surprising if they weren't having a good stir wherever they can.
Trump is not a one man band. He would be nothing without the people who see him as a convenient front man.
He can't even pull toilet paper off his own shoe.