Whilst I agree with your comment that keto /fasting does not suit everybody, the inference that it is involved in your heart attack is something I do not accept. I too have just spent 3 months in hospital following 2 heart attacks, and culminating in a triple bypass operation. I asked my Consultant if my LC diet was to blame, annd he said that the damage to cause a heart attack is generally long term buildup from poor lifestyle over many years, and that my LCHF diet was unlikely to be causative in my recent MI events. As it turned out my MI was due to a bacterial infection that was eventually dealt with by antibiotics. The Consultant has confirmed this in writing to me and my GP and he reiterated that it was not due to recent lifestyle changes.
When atherosclerosis is present, then it is not reversed easily (if at all) by diet, and neither keto nor fasting is linked to improved CVD outcomes by any research I have heard of. These techniques may help in the fight to reverse diabetes, but they are not cure alls as far as I know. There are documented advantages to the diet such as lowering BP, reducing cholesterol, reducing NAFLD and possibly Insulin Resistance, but a T2D is at elevated risk from CVE as a consquence of having the disease,