Some inconsistencies:
He is banned in most bars in Jomtien complex and doesn't drink in bars anyway, yet he shows the naked pictures he took of the boys around in bars?
How would you know about hidden cameras in his room?
No Thai (Lao, Cambodian) boy will care what is written in a contract. I the boy doesn't like the activity, he will refuse and leave.
Sorry, I don't believe any of it.
I have one acquaintance (not a friend!) who "just" does not pay the boys. He got beaten up several times, but does not learn. From that I conclude that someone behaving as you described, would be able to do so only one time.