There are alway good and bad content for media, channel, group, YouTube and etc.
Shooting bad content didn't affected his afford on good content, people still benefited from it.
Shooting good content didn't covered his bad content.
If people are considering a project in his channel during desicion making, can be a reference but in the end it's still a purchaser due diligence for their decision.
If people are simply follow the project his recommend without doing enough due diligence, then the buyer / fans deserved the outcome.
But at least at this moment his is still not yet open course and publicly selling bulk purchase project and ready hurts someone, so it's still worth to watch his video as it free review do not charge pun.
Well if we want to follow the lead of developed nations and follow their financial services rules (even SG does this) then financial loss from people saying silly things with proof becomes sueable.