To be fair, the X1 might be removed for the same reason as the XC40, and the T-Roc. All of which have facelifts lined up in the very near future.
As a sidenote, the Tiguan is a premium SUV regardless of your opinion of it (so is the Audi Q2), and Mercedes is poised to return in Q1 22, potentially offering the GLA again.
Prior: SEAT Ateca Xcellence Lux 1.5 TSI DSG MY19, VW Golf GTE PHEV DSG MY23
Current: Hyundai Ioniq 6 Ultimate
Next: we'll see what's available in 2028.