It's not as simple as "can't claim self-defence if you initiated violence yourself".
If you're targeted personally i suppose. When the violence isn't targeted your running away wouldn't change the situation if there are other people around who can be shot. That reminds about that veteran who attacked the shooter several years ago at the Oregon college - he could have fled i guess, yet he didn't. Did he had an obligation to flee? I don't think anybody there entertained even for a moment such nonsense idea as the shooter's self-defense against the veteran who attacked him and got wounded in that fight. In Kenosha though the shooter shot the guys who tried to stop him (and from any point of view he was the active shooter to be stopped as he didn't stay with his first victim calling/waiting for police and rendering help to the victim as one would do in a true self-defense situation, and as an active shooter he was a threat to everybody, a threat that the people have the right to defend themselves from), and it somehow got successfully sold as self-defense on his part.
I strongly disagree. He left out some very important details from the video. Whether by accident or not, doesn't really matter in this case, IMO. (I know he issued corrections/clarifications in the comments, but most people are not gonna read those)