I know that & this is jio thread. check the airtel website xiaomi handset listed, exact same as you have given.
also check jio website xiaomi handset list, just 3
All I'm saying is a contact at Xiaomi India gave me this list earlier today and I posted it here. Maybe Jio hasn't updated the entire list, because otherwise Jio VoWiFi wouldn't have been working on my OnePlus 7T either... Also he mentioned the firmware update will be gradually rolled out to the smartphones in that list and all of them will have it by the end of March 2020 (which I have mentioned earlier as well).