I’m not saying this guy is definitely a lefty, I don’t think they have enough information to say anything with a lot of confidence yet. He had a one time donation to Act Blue, which doesn’t mean a lot, and he was a registered Republican, which also doesn’t mean a ton either.
There are plenty of 2A lefties that own guns too, a couple of my friends are darn near progressive (US progressive, not EU progressive) and own a decent number of rifles, shotguns, and pistols. Owning a gun or multiple guns does not automatically make you a right winger, at least not in America.
I don’t pretend to know what this guy was thinking though. Just saying it’s still early and we don’t know a ton.