His twitter feed is full of right wing talking points and he broke a 19 year voting hiatus to vote in the 2020 general election, so I don't think it's that unreasonable to think he did, in fact, vote for Trump.
This is what it says there:
> This is a joke. You'll only see this org if you are attempting to troll me about repositories I created when I was learning to program.
https://mobile.twitter.com/jonschlinkert
He definitely voted for trump.