Doesn't your link also say this?
"No definitive case of myocarditis was found. However, the two participants (both women) with vaccine-associated myocardialinjury and chest pain met the Brighton Collaboration case defini-tion Level 2, indicating probable myocarditis in those patients (0.3%[95% CI 0.1–0.9%])"
So 2 of the participants had a .3% possibility?