Is it allowed to watch videos that expose individuals who falsely present themselves as scholars and spread misinformation during their lectures?
Yes if they really spread misinformation and misguide others. But proving that needs concrete evidence confirmed by authentic scholars under the guidance of Marje; of Taqleed. Our own opinions when we dislike a lecturer does not stand as full evidence against him unless we get confirmation from Marje' of Taqleed or authentic Ulama under his guidance.
Wassalam.