If the 'loyal wingman' concept has any merit, Musk is probably right.
The drone needs to be able to at least keep up with the manned fighter, so the pilot is baggage apart from the tactical decision making. The latter is driven by the sensor inputs, which can certainly be handled by an AI.
There is a separate thread highlighting the impact of drones on operations is Syria here:
Here it comes: Syria
It is quite illuminating and the impact of the mainstream military technology now available to Turkey,. Presumably a premier military technology power can do considerably better.