The linked article in the OP states:
"Scientists have identified hallmarks of brain damage in a handful of patients after they died of coronavirus complications"
One would think that AFTER DEATH there would be "brain damage" after all the brain is....well....DEAD!!
after YOU die---your brain can be removed from you SKULL----and placed in formalin-----after several days it get firmed up and can be sliced up and examined----but by bit microscopically.
It is lots of fun. Got a citation---I am interested
in the kind of "damage" to which they are referring