Disagree. The argument for Chinese CVs very much exist, even after China operates CVNs.
I know the argument has been put forward for Jiangnan building a repeat 003 (if this is indeed what they will do, we don't know atm) because it will be ready quicker, but what about the future, especially as you rightly point out the 6th gen planes are bigger hence needing bigger ships to operate them efficiently? For a strategic ship like a carrier that will be in service for at least half a century it makes sense to be as future-proof as possible, in this case being big enough to operate the 6th gens, an increasing variety of UAVs, AND whatever else might come after that.
Besides, LHAs like 076 are getting bigger and bigger in size, it's not inconceivable that a notional future 076A would be even larger, approaching a 003 in size (and certainly capable of supporting EMALs and CTOL aircraft if they will go that route), so from that angle it makes doubtful sense to keep building 003 size CVs in the future alongside CVNs AND large LHAs (as a sidenote, i would not be surprised if the next generation LHAs after 076 are nuclear powered as well)