That is really cool. Just like it was really cool when we learned how to translate neural signals farther away from the motor cortex to do similar things a decade ago. But I'm failing to see the evidence of revolutionary AI. I see a really well-researched piece of hardware paired with a solid understanding of anatomy and probably a few great data scientists to assist in it all.
They train a model that translates signals from the motor cortex to directly stimulate the patient's forearm muscles. It is the first case of a quadriplegic man being able to control his arm directly with his mind.