I think the severely autistic person featured on youtube videos under cdfoakley and kgaccount show someone with the "autistic like" behaviors you discuss when it comes to constant humming and those incessant vocalizations.
As far back as I can remember, a lot of these on the checklist were me as a child. My son also has them. I am still learning about it all and he’s only
Usually when proprioceptive dysfunction is explained the symptoms described are those of proprioceptive undersensitivity: bashing into things, crashing,