The casino could voluntarily disclose your information to your P.O., but they could not be FORCED to do so without a warrant or subpoena. I bet an imaginary penny that my investigator could get your gambling history and status without a warrant or subpoena.
Your P.O. can legally bust into your HOME and shake you down 24/7. Maybe your P.O. is intentionally leading you to believe she is less able to monitor your behavior than she actually is to keep you off guard.
I think you got correct advice.
If a bunch of lawyers told you yes but a casino owner said no why would you believe the owner over the lawyers and assume they all have no experience?
Because I was recently congratulated by an Avvo questioner for having the courage not to use a disclaimer, let me make it clear that I have always answered questions subject to the Avvo general disclaimer. The answers I give are for educational purposes and not to be relied upon for legal advice. No attorney-client relationship is intended or established by virtue of these answers.
When you asked the casino owner, did you ask as someone who was concerned about your playing history? Or did you ask as an investigator? The casino is in the business of making money. The supervisor will say exactly what you want to hear and then show you to a table to start gambling.
Mr. Phillips' answer hits the nail on the head.