EDIT:
So according to this thread, this is a Google related change and not Nvidia?
In which case, similar to the banner issue from a previous update, you can get a different launcher (see comments for FLauncher) to avoid it
https://www.reddit.com/r/ShieldAndroidTV/comments/181vh4t/ads_at_full_screen/
Here is a 1440p 120fps HEVC example over wifi. Left screen is my PC. Analyzing it frame by frame it would guess a added delay of 16-32ms on my Galaxy Tab S7, idk how much of that is the response time of the tablet screen. Note this is without the low latency mode which I disabled because I had some frame pacing over wifi with it.
Looks pretty good!