What if you change the physics of the car? For example you might increase power. Reiza would need to have a way to check the car files.That means they'd have to support mods officially, which, probably for legal reason, they seem not to be keen on.
I very much doubt it. You might have a good driver increasing grip minimally and it would be essentially impossible to tell. There have been similar cases of e-sport drivers doing similar things in 2023.