The UK manufactures parts for the Gripen - so there is a UK veto there. Same with the Korean ( political veto, not industrial unless they want UK eject seats and Meteors AAMs ). Argentinas only options are F16s(cause the USA dont give a crap), Russian and Chinese.
If Argentina has taken a look at Zuhai 2021 they should be see which country (Russia, China) has industry momentum. You are looking to buy a product with a shelf life of 30-40 years from start to finish..
The Mig-35 is an old design that is a dead end as far as mid-life upgrades go and addition of new weapons etc.
China is the only game in town for Argentina.
Not with AUKUS happening, no.