Given what we might expect from the Switch 2's hardware (Ampere-based mobile GPU), it isn't too surprising. Here is the demo running on an RTX 3050 laptop dGPU. With some closed-platform optimizations, an internal resolution of say 720p (instead of 1080p in the video), and maybe more available video-memory a lower powered Orin chip (cut from the same die) probably could do similar.