The BBC article here says:
"A cursory glance at Brand's YouTube channel could suggest someone with a deep belief in conspiracy theories.
But Dr Jasper thinks the reality is more nuanced.
"He stopped short of actively endorsing conspiracy theories on a number of occasions," she says"
The Dr Jasper of the article talks about how big Brand's audience was, and she comments about the fact that what he said was not always very well researched - nuggets of truth intermingled with personal opinion and suggestion - he is presented in the article as a sort of click bait producer.
Quite a lot about the article is about how much Brand was making.... which is a bit naughty really as the criticism should either be about conspriacy theory vs well researched information or about whether as a matter of policy normal people should not be able to make a lot of money out of talking nonsense and being a bad influence on youtube, which many people do, and not conflate the two things. This isn't about Brand, though, more about the conflating of the two issues in the article.
Also, you get extremely well researched journalists and academics being discredited when they give unpopular views. Robert Parry went from being well respected investigated journalist to "Kremlin mouthpiece" when he commented on the US involvement in Maidan. You really couldn't compare Brand with Robert Parry.