He said Muhammad lost his child and the sun didn't give its light. He also said Muhammad could've taken advantage of the situation, but He didn't. I think that maybe he would have had he thought of it.
He spoke of the man that hated Muhammad following and contradicting him. He could've have said I want to be a Muslim and that would've contradicted Muhammad. That isn't true. Because if he did say he wanted to become a Muslim, Muslims would say but he wasn't a real Muslim only one nominally.
Therefore, the speaker in this video wasn't convincing and what he shared doesn't support Muhammad, but only appears to do so. Islam, IMO, is a religion that appears to do or not do things that it doesn't do and does do.