Does Sim Racing Burn Calories?
Unfortunately not!

Like all eSports, sim racing doesn't burn calories 😥
So you will need to find some other excuse to justify your new rig, instead of weight loss!
You could argue that using a powerful Direct Drive wheel and setting the motor to a high setting is quite hard work - it isn't proper exercise, but equally you can't steer the wheel with your little finger like you can in a road car!