Probably a chance for a joint exercise between the two CVs to further train the crew and operations, while simultaneously avoiding an incoming typhoon that is heading for southern China.
Not likely.
Shandong is an operational STO platform.
Fujian is a CAT platform that has not been commisioned, let alone achieved IOC.
J-15 cannot take off from a CAT.
J-15T pilots are not trained for Ski ramps.
So cross-decking exercise cannot happen.
KJ-500 are not operational yet. So cannot lead air wing exercises
I have no idea of the J-15T pilots work up but I doubt they are ready to participate in exercises led by Shandong either.
So no air wing joint exercises either.
Beyond that, what other joint exercise can they meaningfully participate in? Sailing as a combined CSG+ formation?
Also, pulling out a jointEx on such short notice, even if you have a drawer plan ready, without a workup period typically never happens.