I do not know if they are still using the busing for the satellite terminal in KLIA 1. Last month we were bussed from the main terminal in KLIA 1 to the satellite terminal for EVA for the gate. I was told that this was going on due to renovation of the train service to the satellite. So your arrival could be bussed to the main KLIA1 for immigration? Someone who has traveled more recently may be able to update.