Mass inoculation with a new type of vaccine that behaved very differently than the science hypothesized is also a very simple explanation.

I don't really think anyone here has the ability or expertise to judge which is more fitting.

For what it's worth, the fact circulatory issues is mentioned in the article should ring alarm bells for COVID vaccines being a potential cause.

We just found out recently the prevalence of myocarditis among teenage boys that get the vaccine is extremely high compared to what was expected.