I think the Argentinian Air Force also took a deeper look at the PAF, and may have been surprised at its size, capability, and engagements. So in this respect, the JF-17 isn't just some random dinky fighter, but an actual service asset with a very committed user who can help the Argentine Air Force absorb the jet.
Argentina may also expect the PAF to figure out a workable NGFA solution. I don't mean to say they trust us on AZM (I doubt they do), but rather, if we can find a NGFA, then in all likelihood, Argentina can also buy that NGFA.