See here:
https://docs.littlevgl.com/en/html/get-started/pc-simulator.html
It does not emulate the target device, it simply compiles LVGL for your computer’s architecture, and runs it as an executable.
Hint: don’t follow the guide that uses eclipse, just compile the demo project using make, or maybe use the VSCode version.
Let me know if you need help setting up the simulator.