I don’t know about this device specifically, since it seems a bit too specialized for plausible deniability, but a lot of times not being available through insurance is actually an effort to keep costs down for the uninsured and underinsured, as medical devices are regulated much more strictly than things which can be purchased by anyone who wants one, and meeting those regulations and undergoing testing and whatever else is super expensive.

All those weird “as seen on tv” gadgets are that sort of thing, where you go “who is that even for?” because they show able-bodied people using them so as not to imply the thing is a disability aid.