Just look at the Lemmy (highly Progressive demographic) comments around this protest. Lots of "I will not vote for genocide" comments all around.
And bringing up that their refusal to vote for Hillary for similar protests, I.E. "I will not vote for DNC corruption" , contributed to Trumps 2016 win, that resulted in generations of damage, all you get is denials, that the DNC made them do it.
So yeah. Academically, you're right. They are not saying they will not vote for Biden in the general election. But if the progressive dialog around this protest is any indicator, there are many who will not.
Progressives are the easiest vote to disenfranchise. All it takes is one wedge issue, and they are out.