The "Hellscape" stuff was mostly a silly talking point. But so is the assertion that China can or intends to replicate what Ukraine does in the Black Sea (a far more constrained and benevolent environment than even the Taiwan Strait, to say nothing of the wider seas around it) for their own notion of a Taiwan blockade.
As usual observers who started reading up on drones yesterday chime into this topic making sweeping assertions about the future of naval warfare. Note how the actual navies in question behave far more restrained in what they test and how (Jari and Jari-USV-A being a point in case, there's no known association or interest observable from PLAN so far).