The research subject has an incomplete C5/C6 injury and still cannot walk unassisted. Not to mention still has limited use of their hands and likely severely impacted somatosensation. It's not physically possible to manufacture implants dense enough to re-map the entirety (or even a useful fraction) of motor and sensory pathways. Attempting to implant a significant number of artificial electrodes also risks further damage.

I'm not claiming that regenerative treatments and implants can't progress in parallel. I'm simply claiming implants are a dead-end and are distracting resources away from regenerative research.