An extended order of 054A would make some sense if we take the chart A man posted in the speculation thread, where PLAN will be going for a new 059 frigate than 054B.
Maybe they don't see benefit in upgrading the 054 hull with new radar, VLS. I think one of the issues tphuang mentioned about 054/A was it couldn't keep up with the speed of CVNs reliably. So instead of putting funding into another 054 iteration which may not satisfy future threats and growth requirements, PLAN are going to buy a few more 054As (which are enough for the present and near future) and look into a clean sheet frigate and mass produce that instead.
The good thing is that current 054As will still be relevant in future, if an active guided HQ-16 is (likely going to be) developed they can remove the orekhs and stick the new SAM into existing VLS. Or simply switch the current 32 cell with a new 32 cell universal VLS, the space is already there.