...they “believed” I had some unusual heart condition with a small hole present

A condition like that is both very hard to detect and can cause clots that cause ischemic stroke (cell death due to blood being blocked). I'd expect that it's a 'go-to' explanation in place of "we haven't a clue". But... I'm confused here. HBP is typically associated with hemorrhagic stroke (AKA 'brain bleed') - and the treatment is very much not aspirin. And statins? A puzzler, particularly with the “hole in a heart” theory. I’d buy it for LP(a) but then they would have said…

As far as nutrition not being taught in medical school, as best as I can tell, it's a matter of memorizing groups of symptoms and the associated treatment or referral. Human nutrition doesn't 'fit' that model. They do get a good grounding in organic chem and cell biology (part of Pre-Med) and nutrition might build on that, but to be fair, human nutrition has been kind of a mess science-wise up until recently, and even if it was more research-based (like animal nutrition) it doesn't 'fit' the current medical model (deal with illness, not health maintenance).

It's an interesting puzzle - almost on par with chicken-and-egg. Change the model, let med school follow - or change med school, let the change in model flow from there(?)

I'm very much not a doctor or a bio-pro, just have been digging into studies for the last few decades, trying to learn the basic science as I go.

As far as the keto diet goes, I'd point out that there is some genetic variability in whether a lot of dietary saturated fat can lead to insulin resistance (more studies — and I happen to have one of those SNPs). As well, we make fats from excess carbs - and we can only make saturated fats, so lots of sugar is kind of a double-whammy from the subsequent high glucose/ high lipids (triple if you count what it does to the microbiome when consumed in liquid form).