Any source on that video? That's a slam dunk, everything I've seen is property but having his rationale about Black Lives Matter would put people into a tailspin.

Are you certain that he wasn't with a different group (see also https://twitter.com/ElijahSchaffer/status/1298566712179204096 )? I'm not seeing him in this one (though I could be mistaken): https://mobile.twitter.com/ElijahSchaffer/status/1298506102049591296 , but there is an interview with him in: https://twitter.com/RichieMcGinniss/status/1298657958205820928 (I saw another video, but I can't find it at the moment).

Notice that he has long pants on covering all of his legs, while one of the groups has a different green-shirt guy that has shorts that do not cover the lower parts of the legs.

EDIT:

Never mind, it seems that at least some of his friends were in the given group:

https://mobile.twitter.com/Moonsaenn/status/1298606256786149381

Another video: https://twitter.com/i/status/1298549197365444610

Another photo: https://mobile.twitter.com/666onX/status/1298487994072961024 .

I updated my comment, you seem to be right that he was with the group that said that they are BLM libertarians (or supporters?) and support destruction of government property, as they said in this video: https://mobile.twitter.com/ElijahSchaffer/status/1298506102049591296 .

I don't know whether they are a chaos group or not, though you might well be right about that.