I could be wrong but I think dysautonomia and CFS are one in the same. Some people present bigger pulse and BP changes on a tilt table than others. Just like some people with CFS are bed bound and some are able to hold a job.
I am not sure I follow why you think dysautonomia and cfs are one and the same. (I am also not sure if you are referring to cfs or ME.)
If dysautonomia and cfs are the same, wouldn't treatments such as beta-blockers, midodrine, florinef, etc. help all patients?
Those treatment help some patients, with dysautonomia who have a cfs (or ME) diagnosis, but they do not help all of them.
Also some people with dysautonomia can exercise and improve, while patients with ME cannot exercise without worsening of symptoms and function.