If I take your inference correctly bazwillrun, you are saying that Sutcliffe deceived the psychiatrists into diagnosing his mental illness, and now they have seen through his deception.
In fact, diagnosing severe mental illness is extremely difficult, and I would suggest it is beyond anyone to fake it in a manner that would be believed by the medical personal who have diagnosed and treated Broadmooor patients.
That said, it is possible that Sutcliff's condition has responded to treatment to a level where it is determined that Broadmoor is no longer the suitable environment that it has been previously.
So, I would suggest that your point is simplistic - and probably incorrect.