Ange's results are similar to those of Mourinho and Conte, without the CL place of course. But he is not likely to criticize the board as those men did when they were done and wanted to take their money and go.
Ange is lucky to be at this level of football and he knows that if he doesn't want to blow his chance he needs to tow the company line and hope this project pans out. I expect his run will be longer than Mourinho or Conte for that reason, even if results don't improve. Ange is not likely to be rebuffed by Levy on transfers and say "Who's that guy think he is, I've got plenty of money and I can get another job in the first division of a big league anytime I want, I don't need this".
Levy only moved against Mourinho and Conte when insubordination happened, the results being mediocre wasn't enough.