Things were different then. I think ten years ago Argentina wanted to buy Block II and had really strange conditions like full TOT transfer and sending the planes to the US for flight testing evaluations. Apparently they are going for Block III this time, a platform that is far more capable with AESA and full FBW. On top of that, the JF-17 has also participated in combat and though it did not achieve aerial kills in 2019, it demonstrated PAF’s confidence in the aircraft by deploying them in the field of combat. One additional consideration is that relationship between China and Five-Eye nations like GB has soured since the trade war and COVID. China no longer has qualms about exporting aircraft to Argentina in fear of upsetting relations with Britain since the British government is already doing stuff like banning Huawei.
It would be cool to see jf-17 in Argentina, but they are cash screwed more or less. It will not happen, they will get something like second hand Mirage 2000 or whatever cheapest solution available.