Like anything, it's probably a mix. There were plenty of actual Americans on the pro-Gaza side, and there were probably some Russian trolls as well. Now, there are some actual Americans trying to vent about the election. But it would also be naive to think a fair number of them aren't Russian trolls. It's not like the utility of manipulating an adversary nation's political discourse ends after an election.

Since there's no practical benefit to relitigating this old fight, however, it makes sense to just dismiss anyone bringing it up as a Russian bot. There's nothing to be gained by reopening this old wound among the left, but there is plenty to lose.