Building a completely new class of supersized carrier requiring brand new infrastructure seems extremely risky. Not only are you keeping an increased number of very expensive asset (J-XS) in a single basket, but also maintenance will be uniquely vulnerable to disruption due to the increased size and hence reduced number of drydocks that are appropriate.
A couple extra nuclear Fujians will do the job just fine, leaping straight to the biggest when the first CATOBAR carrier is still doing sea trials seems far too ambitious, to put it mildly.
My view is that they'll have to build additional maintenance drydocks anyway, so they can size for whatever carrier they settle on.
And a nuclear carrier will have to be a completely different design to the Fujian.
The Fujian was originally planned with steam catapults and is presumably an evolution of the Shandong which was STOBAR.
I think the size of the ship matters less than the maturity of the technologies that will be out in the ship.