In this case, all evidence points to the lead maintainer sympathizing with DHH's views. If his immediate hostility towards someone politely suggesting the removal of DHH's endorsement didn't make his stance clear enough, here's an archive of his previously public YouTube playlist titled "history," full of talks from far right ideologues like Peter Thiel and Curtis Yarvin.
The relatively small core team has a member giving talks about Neovim at DHH's conference and another one prominently displaying Palantir as their employer in their GitHub profile.
It's clear where their sympathies lie, and that GitHub issue wasn't a one-off coming from a stressful online interaction.
I'm not gonna gather 'evidence' for or against what some guy who happens to maintain a text editor I use thinks about the issues of the day. It's just creepy behavior, and a huge violation of personal boundaries. Why do you think this is an acceptable thing to do? Go outside.
Regardless, the material you've posted doesn't indicate much about him to me beyond that we have political differences, which is okay. That's literally fine. It's definitely not enough to condemn someone as a Nazi sympathizer.
Before telling someone to "go outside," it's a good idea to make sure that you haven't written an entire paragraph filled with personal attacks using fresh throwaway accounts.
The things I listed are very public, each of which has raised very public concern. I didn't have to "collect" anything because the Neovim team already had a reputation for such things.
You may think the issues being raised are just "political differences." Enough people clearly see it differently. For many, the things DHH, Yarvin, and Thiel stand for crosses many lines. White supremacy, mass surveillance, or the destruction of democratic institutions aren't "fine." There's nothing more "creepier" than the ethnic targeting of people that Palantir enables.