Well, your quote is incorrect and, once again, the point is being well and truly avoided. 29 Sqn did not go home between Ascension and Stanley. Had the Harriers been capable of doing the FI air defence, they would never have bothered extending the runway and then moving the real AD jets down there.
And here's the point. The new carriers will need proper AD. Carriers are extremely high value assets. Fast jets are not. But the first issue in chosing your carrier-borne jets is "can it defend the carrier". Then we should look at all the other capabilities.
The aircraft we choose will dictate the carrier's configuration. As things stand, the current choice MAY not cut it.
If the bad guys get to the carrier and sink it, there's no point in even discussing what else she or her jets can do.