No doubt a decrease of smoking, availability of satins, cpr/defibrillators, and stents has led to a massive increase in prevention and survival.

However, the diagnostic and treatment side has improved considerably in that time too. Troponin assays became widely available in the late 1990s/early 2000s, and dual antiplatelet therapy (aspirin + clopidogrel) around 2000s. These are part of the standard toolkit for detecting and treating MIs that simply didn't exist when I was young and are part of the story of making MIs catastrophic events to a more survivable disease.

The article isn't wrong per se, but I do want to point out that it isn't comprehensive when it comes to listing the reasons. There are interesting advances that it left out.