Yeah, this was one I was referring to. Even had heard it was panic button, but one of the insiders I talked to couldn't confirm it was them, just that they had heard it too.
Well it won't be done in Direct X11, NVN should bump the average frame rate from 22 to ~28-30... you have to take into account that the person who did the video here wasn't exactly a team of people porting the game, and like I mentioned they have been working on it for a long enough time that this should be a good port, if it is indeed panic button, I'd expect something close to doom in terms of frame rates, which has improved greatly in recent patches.
Also, on a side note, a Switch Pro with something around an overclocked Tegra X2, would be close to something like this MX150 laptop when docked, just imagine locked 30fps here:
from 4:34;
Max: 30fps
Avg: 22fps
min: 16fps
Not a big difference, but this was what is listed near the end of the video.
The Geforce 830M in that video has a memory bandwidth of 14GB/s, the Switch has nearly double the memory bandwidth, which is likely the biggest bottleneck here. The API is going to be better on the Switch and Panic Button or whoever is porting the game, will do a better job with configurations to really hone in the Switch's performance, it should only increase from what I listed above. Like I said before too, some of the code might have changed to allow mixed precision too, which would allow it to really have a much higher ceiling when portable.
But to be perfectly honest, this game was one that I thought wouldn't come to Switch because of the performance issues it has, but a new API and mixed precision would make it reasonable, and with these reports of a faster Switch coming, I think publishers will be more willing to bring their games to the Switch, regardless of performance issues the current model might have, and remember Nintendo is willing to increase those clocks for developers like they did for MK11, that is a great sign that what might limit the current model before, isn't limiting it now.