It's probably just a statement the State Department and DoD put in to help ensure the deal gets through Congress. They're saying, "hey, we need to keep these F-16s serviceable or else Pakistan will lose the ability to support COIN/CT."
That said, I do think the PAF will try getting the F-16V upgrade for the 18 Block-52+. Not only are these newer airframes, but LM has a SLEP on the market that can extend the lives of these aircraft to 13-14,000 hours. Even if the PAF can't add more new F-16s, upgrading the 18 Block-52+ would at least give us a terrific DACT asset to train our JF-17 and J-10CE pilots.