Vidqun,
The articles may be recent, but they are presenting historical data from decades before covid.That tells me you didn't even read them properly .
You say the onus is on me to prove causation. Sorry, no, it is on you because you are the one adamantly making the claim that recent deaths of athletes are linked to the vaccine. Well, prove it, have you read the autopsy reports? That's how it usually works when you make a claim, you need evidence.
Just because someone brought something to your attention that you were previously unaware of, athletes dying from heart related issues, and then linked it to the covid vaccine, doesn't mean that the vaccine was to blame. As the data shows, it's always been a risk, long before covid.