Not doing a fancy voice one here, just giving you a fast sample of these side by side.
Mavic Air 2 Firmware Update (with App update) allows you to do a Digital Zoom now.
Is it Fake? No. The sensor takes photos at 4000x3000 so you can see that when filming at 3840x2160 its not even using all its pixels.

MODES AVAILABLE:
4K - 1.3x + 2x
2.7K - 1.3x + 2x
1080p - 1.3x, 2x, 3x, 4x

SUMMARY:
4K 1.3x zoom = Groovy Bananas
4K 2x zoom = Treat it like its now 2.7K :/
1080p 4x zoom = not even going to talk about it

I will basically shoot in 4K 1.3x Zoom all the time now, just like the Mavic 2 Pro.

I'm really impressed they added this. This camera surprises me every time that I think I should use my Mavic 2 Pro for a situation instead. Ironically the thing that amazed me the most was that the regular 1080p in this drone is REALLY good. I've never had to try it before until now when comparing the 4x zoom with the normal 1080p. I'm glad they figured out how to get it working so well with H.265, because back in the Mavic Pro 1 days the 1080p was horrible.

I understand they didn't NEED to add this, and the 1080p 4x zoom is just for fun because why not and there is utility use with it, but that 4K 1.3x zoom alone would have been an instant sell to me IF they had given that option alone. Super happy DJI added this