Why

Why not? Nothing wrong with research and development as long as everyone participating in the test is a consenting adult IMO. The advancements could make current accessibility tech even better. For one reason or another, a quadriplegic person decided they were willing to take the risk, so maybe they consider current accessibility tech for quadriplegics to be insufficient and wanted to try for something better?

Please dude I promise you this is near universally hated by disabled people 😭

Well damn, I didn't know.