Probably largely the same people but cultures can change even if none of the membership does.
Anyway two points:
- The vicious racism was already enough of a consistent thing in the 2000s that I clocked it as essentially a movement at that point. They always claimed to be joking but even then it was clear that many of them were not. Regardless of what other political affiliations were commonly held there at that time. But I think you got it pretty close, they weren't that politically coherent back then, and certainly not leftist so much as just anti-bush/anti-republican.
- Gamergate was a permanent rearrangement, finally giving a coherent "them" to orient a reactionary antipolitical movement against. I think the sharp ramp up in aggressiveness and frankly violent imagery filtered a lot of people out, while simultaneously inviting people in, creating a new overlap with pre-existing and nascent reactionary groups like (self-identified I don't mean this as an insult per se) reddit incels.
So having kept an eye on it for a while now, I think it has meaningfully changed since 2008, even if a lot of the members are the same and many of the cultural signifiers are intact. Just for one it is much more coherent as an allegiance or identity, as you can see by the dozens of people coming out to passionately defend it in these comments.
As in mostly anti Bush-establishment, lefty, pro-freedom, 'rational' anti-religion atheists.
I'd say the most of my (admittedly fuzzy) memories of that era of 4chan political activism were Aaron Swartz/Anonymous.