so now the worst part they are indeed now having to split the J15 between two carriers
very bad
Planes are not wedded to their carriers. Given that aircraft carriers, like all naval vessels, have significant downtime, it would be suboptimal for aircraft to be wedded to a single carrier. Of course aircraft have even more downtime than ships, but at sea this occurs on a more or less continuous basis
within a squadron or air wing (although of course there are also longer periods of downtime ashore for training, deep maintenance and recreation). Even USN only has 9 carrier air wings for its 11 carriers.
It is certainly not ideal to be operating two carriers with only ~24 J-15s between them, but it is not a catastrophe or a waste of a second carrier. Given the delay in further airframes to date, it is likely that PLAN and SAC are waiting for a CATOBAR "J-15D" to reach a full level of maturity and readiness. They will likely end up producing a significant number of airframes (up to triple digits) and those aircraft will fulfil PLAN requirements until the next generation arrives in meaningful numbers. Undoubtedly SAC could've pumped out another dozen or two dozen J-15s by now if PLAN and CMC felt it was sufficiently important, but they haven't. PLAN has the airframe numbers it needs for training and the development of procedures, now they are laying the foundations for the capabilities they require in the medium-long term rather than maximising numbers of more limited aircraft in the present.