Its not supposed to be ground for generalisation, but it may be the discovery of interesting side-effects to learn more about:

(1) "Scientists discovered that the virus had destroyed endothelial cells by observing patients who died of Covid."

(2) "In the first instance, it should be pointed out that the deaths observed were rare and, above all, that the damage to the brain was potentially reversible."

(3) "The study shows this could be the case for patients who developed a severe form of the disease. For people who have had a more minor form of the illness, however, nothing is certain."

I.e. these people died ... so selection bias is quite likely.