Not at all, the same thing happened to me 2 years ago. They know what happened but are not saying for a reason. They went completely through my heart while I was in coma and found nothing wrong with it.
Why are they not giving heart details? Is there myocarditis?
Because this is not how myocarditis presents. Particularly brief and self limited myocarditis.
There would be no way to diagnose a myocarditis post arrest as all the abnormalities seem with myocarditis are present post arrest due to the arrest and resuscitation efforts. However vaccine associated myocarditis for the overwhelming majority is mild and resolves in a few days. everything that happened to this player can be easily explained without invoking myocarditis. Unless he had a vaccine within a few days of the incident the vaccine would be highly unlikely to be involved. Eve if he had a vaccine within a few days it would be unlikely but one could make an argument for it