No, Buffalo Guy is not BLM. He’s a Q-Tard from AZ. His photo from a BLM rally was deceptively cropped to not show his Q poster. This has been exposed in several threads on FR. There were at least a few Antifa, though. Helmets and backpacks are a giveaway
That pic was taken at a BLM rally from what I understand and that poster read more like a facetious dig at the whole Q-Anon crap. Probably more of a career agitator.