I guess that would be a big concern if 301 wasn't literally the number of participants in the study. What kind of confidence interval can you extrapolate from that?

And elevated troponin is not definitive of permanent heart damage.

In the context of Kim Jung Gi's death, studies suggest an excess of <5 cases of myocarditis per 100,000 vaccine doses for men aged 40-50: https://www.nature.com/articles/s41467-022-31401-5/figures/3

I suspect this is considerably less of a risk to that age bracket than COVID.