for me, its the topic.
For instance- if Joe Rogan having a guy who claims to have been working in Wuhan when Covid 19 began and he knows who started it, id be skeptical because of Joes views on it.
When Howard talks at length about Israel ( and US ) and Palestine/Gaza situation, i understand he is biased.
In this case, we are entering a period where UFO existence is really about to be confirmed. There is just too much info out there for whatever agencies responsbile for and looking to keep quiet. So in that sense, when Joe has this guy on - who has been on many other forms of media- not just Joe Rogan, then i lean to listening to what he says and how he says it to determine credibility.
I dont discount his credibility BECAUSE he is on Joe Rogan show.
Example- i dont tune in to Fox News for info on Dems and CNN for info on Repubs....but i would tune in to either to hear what Lazar had to say on topic of aliens.