They did, and technically the underpinnings exist for you to do the same thing on Linux (Nvidia PRIME render offloading). Generally though, if you're a 3D creator or ML researcher I could definitely see this machine making a case for itself.
I can't imagine why a professional would train on a laptop. These days a lot of models need a minimum of 20GB vram to get reasonable speeds. Not to mention GPU prices have crashed. A lot of consumer motherboards can run 4 x 3090 for $800 each.
