His link also says:
"Researchers in Israel spotted 2.7 extra cases of myocarditis per 100,000 people who were injected with the Pfizer vaccine, but this shot up to 11 additional cases for every 100,000 individuals who caught the virus" indicating catching Covid gives a 4x greater chance of myocarditis than taking the Pfizer vaccine.
And the following summary of the "largest Covid vaccine research" that he posted. Tells quite a different story than the one he intended:
Largest Covid vaccine study ever finds shots are linked to small increased risk of neurological, blood and heart disorders - but they are still extremely rare | Daily Mail Online