Welcome to the forum, soulution
I totally agree with you, about part of the POIS symptoms looking like symptoms of brain inflammation (encephalitis). I have proposed that opinion a while ago, on the forum, like here :
https://poiscenter.com/forums/index.php?topic=2078.msg16432#msg16432 .
At the end of the article you linked too, they mention a list of supplements that can be used to help with brain inflammation. I used many of those through the years. I am still using curcumin quite often. and catechin through green tea, one of the first allies I found against POIS. I also used chamomile tea for the apigenin in it.
Curcumin is still part of my pre-pack to avoid POIS symptoms.