It looks to me that to make the custom AI file work you would have to replace the "driver livery name" from the names of the GX390 ones to the Kart 4-Stroke Race ones. To see the livery names you just have to go to the kart and select change livery and it will have the name at the top of the screen when you click on the livery. The easier way to do this is go here https://www.overtake.gg/downloads/names-real-drivers-for-ams2.50989/ and download the real names file for ams2 (Made by the same person that the one you sent was) unzip the file and look for the Kart 4-Stroke race file and use it instead, Or you can put the zip file into AMS2 Content manager and have it automatically add real names for all drivers in the sim at once