Why COVID-19 is considered to be a respiratory disease
Medical professionals and researchers have been studying the link between COVID-19 and vascular symptoms since the beginning of the pandemic [..] These observations led to several hypotheses that COVID-19 was a vascular disease with respiratory symptoms and not a respiratory disease.
Studies in 2020 and 2021 supported this theory. These studies concluded that although people with mild to moderate COVID-19 only had respiratory symptoms, COVID-19 was primarily a vascular disease. However, additional studies published later in 2021 and into 2022 have contraindicated these findings. New studies indicate that COVID-19 doesn’t attack the vascular system at all.
While this data on its own can't tell us it's the vaccine protecting people from dying - there are too many complicating factors - if vaccines were driving excess deaths we would expect this to be the other way around."
Alternative explanation. You only see the heart inflammation in young men because its unusual. In older people you already have it because of age so extra inflammation could go undetected.