I'm gonna step into my nerd shoes here, so bear with me. Politics is kinda my thing.
PA has a closed primary system, which as you may know requires you to be registered with the party in order to pull their primary ballot. He did not pull a ballot during Pennsylvania's primary back in April, which suggests that he was not someone looking to vote for Haley or any other R candidate (as a side note, it is public information when you pull a ballot, and during primary season, you can see which party's ballot was pulled, but you cannot see WHO one voted for). To my knowledge, he also did not pull ANY ballot in 2022 (general or primary).
To the donation, he registered as a Republican in 2022 and was 17 in 2021 when he donated on Biden's inauguration day. The donation amount was a whopping $15. Also, Inauguration Day, in my opinion, is the SINGLE LEAST IMPACTFUL day to donate to any candidate or PAC, as you quite literally could not be further from a single important vote or event for an upcoming election. To me, this screams that he lost a bet and donated, but I don't think this is a super important detail.
He was also found wearing a super pro-gun youtuber's merch and had been seen in this merch before.
All this to say, this dude was a nut. I (obviously) don't know his motives, but I lean against him being a sleeper agent or deranged demonrat, as it would have made sense for him to at least pull ballots in the 2022 primary and/or general (depending on when he turned 18), and the primary in 2024.