That is no guerilla. That is a man who seems to revel in making a spectacle. Throughout the video, he does little more than strike out at a group. He offers no logical positions, does not make his arguments, and thus cannot hope to convert.
Assuming he is rational, he must have attended for a reason. Further, he must know his chances of converting other attendees is abysmal - for two reasons, the first of which I've mentioned. The second reason is because they are not good prospects. It is like trying to sell antibiotics to christian scientists, or calculus textbooks to NBA players.
Given that he must know he cannot convert, he must be there to create a spectacle. More power to him, but he is no guerilla.