We do not know how many 09Vs are in various stages of production, but 3-4 seems to be a reasonable guess and if we take it at face value, there is no reason why 3-4 09Vs at various stags of production would mean "there will not be a second batch of 09IIIBs".
Considering "various stages of production" can mean anything from fabrication of long lead items, pressure hull fabrication, assembly, or preparation for launch, 3-4 09Vs isn't actually that many boats, and it would be very normal for additional SSNs (like additional 09IIIBs) to also be in various stages of production alongside it given the PLAN's assumed appetite for new SSNs.
Even if we assume a relatively moderate 3x SSN per year production rate for the next few years (which they probably are able to spin up to at this point) and assume that 1 is 09V and 2 are 09IIIBs, let's say if they placed an order for 4x 09Vs and 8x 09IIIBs that would be an order that would be all launched by the end of 2029, which would require long lead production of all of those boats to already be in "various stages of production".
All of this is ignoring that in the last few years all talk of 09V has coincided with rumours that 09IIIB will still be procured for a while alongside 09V initially at least.