I realized he is very knowledgeable
Citation needed.
Hasan has the same knowledge as an average poster on this website. The average poster doesn't know the differences between Mao and Lenin or China and USSR. Half the posters on this site don't even understand the disagreements between the movements they claim to like.
Hasan literally would tell you this is nerd shit as a deflection when asked (same thing that Felix from Chapo does cuz it's cool not to know basic history about the thing you claim to be). Hasan literally doesn't know how to employ the basics of journalism. When pinned against the wall Hasan will admit that he's entertainment. What you're mistaking for knowledge is the fact that he reads leftist news aggregators all day and his chat is literally one. That's not knowledge that's chattering.
Hasan's strength is that he can understand what vaguely center-to-center-leftish normies vibe with and find convincing, he's a filter, but there's no real depth there.
Half the responses in here are like "he's organizing the working class" which is the lulziest shit ever because for some reason y'all think organizing is posting memes and streaming.
Depends on what you define left, but if it's left of the DNC and corporate media than he's one of the biggest no doubt about it.