I was not aware of that. Which is strange since I read more than 10 reviews, surely they would have noticed? is this your experience? All I heard was that it runs smoother than in the Wii-U even though it is not optimized for the Switch.
Many reviews have pointed out that the 720p tablet run of the game runs smoother than the docked form, which apparently has noticeable frame-rate drops.
I guess it's the way I understood it. "Drops frames occasionally when there are a lot of elements moving on the screen" vs "plays poorly". Disappointing, sure, but hardly a deal breaker. I guess I'll wait a bit and judge on my own.
It outputs 4k resolution no matter what, AFAIK. But yes, the Android TV games in general are not that demanding, so it's not a huge challenge. But they look stellar.