A handful of additional 054As could certainly be explained as filling a gap left by a delayed 054B, but talk of "double digit" numbers stretches that explanation, and "parallel production" kills it entirely.
If this information is accurate, I think it reinforces the rumour that "054B" is to be a significantly larger and more capable vessel than 054A, more akin to a FREMM or Akizuki-class vessel. Parallel production in particular, but also "double digit" numbers of additional "054As" (presumably built to a similar standard as the 054APs for Pakistan) are much easier to explain if the two types are in fact substantially different ships intended for different roles.
Double digit I take it would be at least 10 ships or more. It means ships with long production cycles and large numbers.
I would agree with you that 054B is a bigger ship, more complex, and likely, longer to make. And I think that is why the 054A production has restarted. The ship can be built quicker, cheaper, and its already proven. From the beginning to steel cutting to training to putting the ship in service, the cycle can be faster. The reason for this is the sudden urgency to put as many ships into service because the circumstances around China has heated up.
Previous to that, the danger of investing in large 'double digit' fleets is the risk that over time, you end up with a huge inventory of obsolete ships. However, China now is going to take that risk, because of circumstances. None of the other programs however, are cancelled, and they will go through with their momentum. From the way I read it, more 052D and 055 will also be produced. The 054B program may already have been signed on and significant development and investment have been made, so this is going to go through. But because of the circumstances, the 054B numbers and time of delivery may not be enough, so they plan on producing more 054A, which they have proven they can produce quickly like hot potatoes.
And yes, very likely the new batch of 054A and the 054B will be built simultaneously because of this. I am going to add that MLUs on the remaining older ships (Sov, 051C, 052B, 054) are going to happen and speed up.