I do not understand this take. There was a thread this week about 'Player Power' being out of control with playing staff able to invalidate their contracts by refusing to train and forcing a move. Ultimately contracts and loyalty are a two-way street. If Jones was fully fit and was trying to force a move through to Bordeaux against the club's wishes, we'd be slating him. If he wants to stay and see out the rest of his contract while working towards full fitness, that's equally his prerogative. United have the option to terminate for the full value also, that's their prerogative.
If Jones had displayed incompetence and breached implied trust/confidence by returning overweight (Kalvin Phillips, Eden Hazard, Romelu Lukaku, etc.) or taken drugs punishments (Adrian Mutu, Rio Ferdinand, etc.) which had made their position untenable then I would understand some of the anger towards him. However, from any reliable source he is a dedicated professional, trying to return to playing regularly if possible and has a young family based in North West England with his daughter at school entry age. I would imagine his loyalties lie with their better interests understandably rather than reducing United's wage bill.
You're suggesting he's a pisstaker but there's no evidence of it. United understand his long-term needs for managing his condition and he's within his rights to remain here.
As said elsewhere, I doubt this is how he would want his career to have gone...