Please, try to provide counter-arguments to the evidence present in the video, not just random links to half-dead legacy media. And yes, antifa are no longer affiliated with DP. If they somehow find common ground with the other extreme, things will get real stupid real quick.
As far as I can tell the video only provides evidence of one person with ties to "Insurgence USA" (a left wing group) being inside the capital during the protest. No evidence for 'antifa' and no evidence that there was any organized left-wing presence.