Yeah its been a while coming. This has not been a Milei thing I dont think as this descion would have had to have happened in Aug-23/Sep-23 if Congress authorised it in Oct-23 (
Link). It did seem like a longer term plan for once that Milei and his team ran with.
I also think this brings the option of closer cooperation with Chilean airforce as well as they operate F-16s (although they are about to be modernised) but its the same weapons platfom essentially.
The F-16 is just the superior choice to anything else out there for Argentina at the moment. Its proven, cheap, reliable, and is just a fantastic little multirole fighter. There are tonnes of other aircraft that are better than it at doing specific things but its one of the most versatile aircraft out there. The JF-17 is still relatively unproven but looks really decent from what can be seen.