That wasn't a demonstration, it was a carnival side show act designed to take investors' money. Haven't seen anything like that since the tunnel days.
Elon Musk/Neuralink
August 29, 2020
https://www.crazydaysandnights.net/2020/09/blind-items-revealed-5_5.html#disqus_thread
https://www.crazydaysandnights.net/2020/09/blind-items-revealed-5_5.html#disqus_thread