Not particularly relevant either.
Here's a report from the same source (NIH) discussing actual vaccine recipients. Notice the difference.
Acute myocarditis after a second dose of the mRNA COVID-19 vaccine
You’re correct, there’s a huge difference between the studies cited. Mine looked at 24 patients with up to 31 year followup, concentrating on long term effects. Yours looked at a whole 2 patients for what, a year maybe and concluded that the both survived the acute phase, a point that I have already conceded. Once again, recovery from the acute phase isn’t the issue.