Pre Covid Amristar was not well served, go East to New Dehli or South to Mumbai in India to transfer back, thus the STN ATQ route was born, close to Pakistan boarder as well.
Tanmanjeet Singh Dhesi MP campaigned for such a service for years.
I'm sure it will be back but AI are a bit of an odd ball and now being sold to Tata and assets moved whilst debt remains with AI, I suspect attentions will be other places, maybe another player will step in?