We're introducing a new aircraft type while we are also introducing a new carrier (maybe two). There is simply no way that they were both going to arrive at exactly the same time, so we were either going to have folks complaining that we have the jets but no ship to fly them off, or (as is the case) we will have the ships but no jets to fly off them.
That was always going to be the case, and the BBC report alters nothing in terms of these plans for the projected IOCs of the aircraft and/or the carriers.
The BBC was incorrect when it said that the intended first order for 14 has been reduced to just 4. The '14' number comes from the Main Gate 4 acquisition approval, with the four ordered being the first batch from this first batch - this was always the plan.
And what does it matter that the USMC will be flying off the ships first? As was made clear in the report, the Royal Navy needs to build up its entire carrier capability (logistics, CONOPS, flight deck movements, maintainers, etc), and having USMC jets (perhaps even piloted by UK crews) on the ship allows the navy to do this, and actually somewhat de-risks the programme for the UK.
I watched the BBC report, and saw nothing new or particularly interesting in it to be honest.