So yeah, I think he's a joke all around
I've been training aikido for over 10 years and have been to japan for dedicated training a handful of times, many of those training under Isoyama sensei, the guy who taught Steven Seagal. He had this to say about him:
*Note: Isoyama Sensei is known for being notoriously cruel during training so often it would be wise go along somewhat when he was presenting techniques and stuff
'During a nikkyo[wrist pressure technique which you apply until opponent claps out] I had gotten him[Steven] down on the ground clapping and I stopped and looked him straight into the eyes and said
You're a lousy actor!, and did the nikkyo with full force on him!
So yeah he's a big joke even in the world of aikido.