A deep neural adaptive PID controller would be a bit overkill for a simple robot arm, but for say a flexible-link robot arm it could prove useful. They can also work as part of the controller for systems governed by partial differential equations, like in fluid dynamics. They’re also great for system identification, the results of which might indicate that the ultimate controller should be some “boring” algorithm.
From Wikipedia:
So unless you live in a country that runs on Sharia law and have your real information connected to your account, you can safely ignore it.
You could report the poster for being mean if it goes against that community’s or instance’s rules. Up to you. But I think someone’s just being a troll.