Yes it still works.at 0:39 you can see it switches from 90 to 120 fov. If you just minimize the game, I believe it will still be in 120fov. But when you close the game, it switches back to 90 fov and you have to overwrite the settings file again👍
changing the fps shouldn't affect the fov. 120 fov will only revert back to 90 once you change the fov slider. that's actually the case for me. i hope it is aswell for you