Hidden Side Paranormal Intercept Bus, Ghost Video Game?
According to the set designer for the Paranormal Intercept Bus set, Niek van Slagmaat, the released product contains 3 references in total, which he identified in a presentation at BrickFair Virginia 2019.

You can skip ahead to the 22:43 time to hear him talk about the sticker sheet and the references it makes, which are listed below.




Rock Raiders icon
License plate number GG 4940 (Rock Raiders set 4940 The Granit Grinder)
Bionicle video game (The Legend of Mata Nui, the unreleased game which leaked online shortly before the set was being designed)


He also identifies the purple sticker in question as a radar screen.


  I decided to just pick whatever Bionicle video game I could find and this one worked quite well so we ended up putting it on the secondary screen so while she's hunting for ghosts on this computer here using the radar she's also just playing some Bionicle game off on the side.


This confirms this screen is intended to represent the world in which the set takes place, and not reference another old Lego game.