As you point out, we know sudden cardiac death can occur in athletes. So the question becomes, has baseline levels of sudden cardiac death increased among young athletes. In November, Israel reported a
5-fold increase of such deaths.
The myocarditis from vaccine hasn't been proven to cause permanent heart damage.... yet. I heard one nurse saying she saw scaring on 1/3rd of young boys in their MRI imaging who were treated for vaccine induced myocarditis. So we'll see how that plays out. Scarring is permanent and this vaccine damage has only just begun to be investigated.
While COVID could cause the same injuries - what has not been studied at all is if early treatment with ivermectin can stop COVID myocarditis from forming while simultaneously giving the benefits of broad immunity through natural infection. Oh, and risk of COVID myocarditis in boys is much
much lower than the vaccine.