He doesn't have knowledge of psychology. That's like saying I have knowledge of the culinary arts because I can cook a lentil and carrot soup. He 'studied' psychology at college (community college for those who are American), which is an extremely low level. It's the equivalent of someone studying French and knowing how to say their name, where they come from, and what hobbies they have.
The biggest Joshua fanboy of them all, and a really touchy character is "boxing beats and rhymes". That guy is hypersensitive and like Hatman, doesn't show his face. You can tell from his voice that he's really overweight, though.
Been subscribed to him for probably ten years already, watch nearly all his videos that show up. He has started making shorter videos of late as I think his attention has shifted toward paid content so the yt videos have become kinda half assed unfortunately but I really like his insights and agree on most things he says. I do agree on the "I told you so approach" though, he needs to check himself on that and just reign in it sometimes. Though he has gotten predictions wrong sometimes and praised those that got them right. I genuinely don't see how he's a fan of any one fighter, having listened to him for this long he's dished out criticism and praise equally. I remember when he praised Fury for years for dethroning Klitschko and the Wilder fights but he's been scathing toward him in recent years for messing the whole boxing world around. The way I see it, newer viewers might watch him, see criticism aimed one way and then assume he's a fanboy of the other without actually knowing his track record. He called out AJ's mental fragility throughout those difficult years post Andy Ruiz fight etc and commented on how weird AJ behaves with people.
In fairness I did say that I do not know the depth or degree of that knowledge. Only that he has it, to some degree. I am not making any observations beyond that.