The athletes in question had Covid, the disease, not the vaccine.
“Subclinical myocarditis, without specific symptoms, may be inferred by transient increases in troponin (a biomarker of cardiac damage) or ECG, which measures the electrical activity of the heart, after an acute viral illness, adverse drug reaction, or rarely vaccination.”
https://www.myocarditisfoundation.org/research-and-grants/faqs/types-of-myocarditis/
Can you name me one institution of higher learning (snort) with an NCAA sports program that did NOT have a vaxx mandate for athletes...?
Just one.
BTW, how do we know those athletes did in fact have the coof?