Like most things with this administration it’s likely to be targeted in implementation would be my guess.
Argentina you’re likely safe if you have diabetes. Bolivia not so much.
It’s also worth pointing out the elephant in the room here: for the overwhelming majority of people living in the US sponsoring a foreign spouse this won’t be an issue. The costs associated with maintaining a cross-border relationship are considerable, and to get to the point where you have enough evidence of bona fides, you’re going to have spent substantial money to the level that your income should qualify regardless of health conditions. We see a lot of the edge cases here, but just by its nature an international relationship tends to weed out people without sufficient funds.
This will have more of an impact on people living abroad with spouses, retirees, and college kids applying for AOS than anyone else. Sponsor working a job in the US that can sustain an international relationship likely doesn’t have much to worry about.