True, but everything he posted about was MA, not sups. And most IMO's will not release MA contracts even if you have not written business.
My Coventry contract is with Parker and Asses to this day and my Wellcare is with RBI. I haven't written either in over 7 years but they still hold my contracts. Neither will release.
But, if he was never contracted then it's not an issue.
I'll have to disagree that "most" don't release. I find it to be the other way around. However, if you were specifically talking about "during AEP", then yes, you would be correct. Actually, it's many of the companies who won't transfer you during AEP.
Other than that, I think "most" would release you.