Airtel probably paused the update to sort out any bugs or feedback.
Like I mentioned above, you're not missing out on any useful features except for the Dolby sound which is now enabled. Other than some GUI changes, the experience has now in fact got worse with the box getting sluggish and some apps like Prime Video becoming nearly unusable (buffering, subtitle lag/mismatch).
In my opinion you're better off on the Android 9 version for the XStream Box 1 unless they have sorted out the bugs.
I got updated in previous slot, in that android 11, I haven't get this app volume updated, so it looks like this is newer version compare to previous android 11 update.