My guess is they are desperately trying every insane treatment to heal him right now. He's probably undergoing dialysis or chemotherapy. Guillian Barre cannot be hidden and people are going to know if it's a body double. Not a fan of the guy but I suspect he is going through the nine circles of hell at the moment, right here on the material plane.

The vaccines shred the etheric body, so anything they do on the allopathic medicine front is likely to just make Newsom's condition worse. Allopathic medicine has been the blind leading the blind for a very long time.