This is just one of the thousands of cases of a journalists fawning over any ML/AI thing with no understanding of the garbage-in garbage-out problem, and all the other issues with ML. You are completely right, attempting to simulate an individuals coronary systems is 100% out of our wheelhouse right now. At very best it's going to tell us things we already know, that people with clogged arteries are at risk of a heart attack. At worst it's a grift on par with fully body scans on healthy individuals.
I'm not saying ML is useless, far from it, but this is reminding me a lot of Eric Yuan (the CEO of Zoom) talking about AI clones in meetings: https://www.youtube.com/watch?v=dKmAg4S2KeE