There’s many pre-Covid studies over at PubMed concerning sudden deaths of young people, particularly athletes. This goes back decades. Young athletes have an even higher rate of cardiac death than their non athlete peers.
None of this is new to the medical world. What is new is jab obsessed nuts suddenly discovering sudden deaths. And then in all of their massive medical wisdom announcing to the public at large that vaccines did it.
You're correct in saying it's not something that's never happened before. What's new is, there's been a >30% INCREASE in the rates of such since the covid epidemic. People are seeing and hearing about it more often.
The timing suggests that it COULD be because of the vaxxes. The rates started increasing after the rollout of the vaccines. But, the Vaxxes came out really quickly. And, since practically everyone got the vax, and ALSO had covid, it's debatable about which one was the cause. Most likely, both contribute to the increase.
But, without question... there has been a statistically significant increase in just the past 2 years.