I think you nailed it with "leftists". The comment I responded to didn't bother with the quotes.
The whole point of this obvious right wing psy-op is to drive a wedge between liberals and leftists. When liberals don't distinguish between "leftists" and leftists, it plays right into their hands.
These operatives are running a two pronged attack. They aren't just impersonating leftists, they also imitate liberals preaching from their high horses like Hillary Clinton on steroids. Liberals should take care not to do that work for them.
Or, they might vote Republican. In 2016, Clinton was na clear establishment candidate and Trump was a (fake) populist. Voters who went Green or Libertarian as a vote against the establishment were unlikely to swing to Hillary.
I'm not sure that dynamic still holds now. The MAGA faithful think Trump is a populist, but I don't think anyone else does.