I think it's the wrong Forum for that question.
But, if you have them in the correct folder the AI Busses should drive with these repaints too.
The game takes them randomly, so you won't be able to see all busses are driving with the custom repaint.
Also, you have to see which Bus you've add the repaint too. If you have a map where only D92 busses are driving, you are going to see, custom repaints for D92 more often.
If other busses are driving too and you haven't got that repaint in their folder, you won't see them.
I hope I could help you