Great video! He made some really solid points. I hope some of the audience of Contrapoints sees it.
Prefiguration really is the answer in so many cases. I think he could have emphasised, though, that while the road to rebuilding a real revolutionary left is long, every step along the path of prefiguration can and does make a practical difference to people's lives. The pressure that can be brought to bear on elected officials will also grow little by little.
Regarding disengaging from electoral politics, I think that radicals, since they're people who are very interested in politics, have often become so highly engaged with electoral politics that they find it difficult to kick the habit. Also, I think there's a perception that keeping up with the minutiae of bills and appointments is essential for being taken seriously when discussing politics.