I don't understand how his statement can be true?
It was quite obviously not and never could be based on the published figures as it would defy the laws of physics. CM has been saying the same thing for years.
but it will only fulfil the RN's requirements if they are not severely tested in their defence of the fleet role. Suggestions here about the current state of potential enemy orbats need to take account of the timeframe involved for the FAA's IOC, let alone any meaningful capability.
There isn't any other aircraft that fulfil that role, is there? Presumably you are talking defence from land based aircraft.
Potential enemies are subject to the economic, time and design issues but more so. Not something to depend upon, admittedly.