My perspective is European & Australian, so I wonder if that skews it.
"far right" and "far left" are terms for contextualizing a political stance, based on the world view and actions. It's doesn't matter where the majority of people stands, they can be all far right or far left or in the center, it wouldn't change the definitions.
If you think a party is ticking many boxes, you may label it as "far-right".
> nationalism, authoritarianism
Sure, you could say he supports this.
> anti-socialism
Not a fair right position. This I'd what anybody who is right of the center left position thinks.
> economic libertarianism
Trump doesn't support this. He wants all sorts of tariffs and the like.
> racial and gender hierarchies
I haven't seen any proof he supports such a thing.
> anti-establishment sentiments.
This is not a far right position. This is a populist position.
The US left (federally, not talking Alabama dems here) is generally more left on immigration, abortion and LGBTQ+ and affirmative action type policies than Europe, broadly speaking. Drug policy is a wash IMO. There's a lot more variation in Europe because the EU doesn't arbitrate social issues the way the US federal government does.
Sorry if that feels like a strawman, but I find the idea of using popularity to determining what counts as "far" stupid and dangerous.
They are not centrist by any stretch of the imagination.
So they would kinda feel feel far-rightish to us only because the democrats are more conservative than ours