I havent read the article but about to read it, I saw your comment first. I assume she's in the same kind of boat so will comment on it
When Im very sick, Im too sick to even sit up for long if at all, let alone use a wheelchair (to be pushed places). Most with severe ME have orthostatic intollerence at least to a degree, so this often means they cant even sit up for long. I overcome some how long I can be in a wheelchair for as Ive a very special wheelchair in which has raised legs (Im unable to push myself far at all thou in it). The electric ones Ive seen, dont have raised leg options.
There is also the issue with being in a wheelchair, I can fall out of it, on my very bad days, due to effort involved in sitting up, means I will be slumped over, I can be having trouble holding my head up (my wheelchair dont have straps). If I have ME spasm or a ME near seizure or if Im starting to loose consicousness due to orthostatic intollerance, I could easily fall out the chair!
I had some nurses one time have to actually hold me into the chair to stop me from falling out of it, get me out of hospital toilet room after I'd collapsed there (after having to wait too long in the waiting room to see doctor).
To strap someone with ME who gets orthostatic intollerance into a wheelchair would be highly dangerous and can lead to an unconscious person being strapped upright with their brains being starved of blood and oxygen.
Another issue I get why I cant be put into a wheelchair on my worser times, is the movement of being pushed in the chair. That can be way overstimulating for my head and cause me to go into violent jerking and basically cause what looks like a seizure. When I bad, I cant cope with things passing quickly by which happens when being pushed in chair.
Most of those who have very severe ME are unable to use wheelchairs.