I have an actual cardiologist in my family and literally they first thing they learned about Covid in 2020 was that people who survived a Covid infection were at a much higher risk of heart attacks and strokes post infection. This was pre-vaccine rollout.
The idea of blaming heart attacks and strokes on the vaccine isn't support by data separating cases by age and vaccination status cases per 100,000 either.
Spoiler alert- It is covid.