Early Switch 2 emulation is real, but this video leaves out a massive catch.

Projects like Eglantine nx2 can boot Mario Kart World, but getting 60 FPS requires top tier PC hardware like the i9 processor hidden in their own overlay. An old budget card like an RX 580 will struggle with severe stuttering and crashes. You also still need a hacked Switch 2 to legally dump system keys and firmware. It is far from a plug and play replacement for the console yet.