Interesting…
I hadn’t spotted that…
Curiously, the Inspire pic I posted did have a battery temp showing 
What’s possibly even more strange, is that I have two flights on the same day, with the Mavic Pro, one with battery data and one without.
Check the time stamp:
Then later the same day:
I used different batteries for each flight, perhaps one (or more!) of those batts don’t report temperature?!
But why…
Any FAQs on Airdata about this?
I might do a bit more digging in to my Airdata history and see if this only happens on certain batteries.