From a technical point of view, the Switch is a lot different to the existing consoles. Yes, he mentions this but doesn't stress it enough.
We already have varying levels of architecture with different features on the GPU side, we have different APIs and different SDKs. Porting nowadays doesn't mean you have to rewrite the whole code but don't expect it to be easy only when NVidia says so. It won't as the Switch won't have the same power as the current consoles which means adjusting the game in a serious way and they have to port their engines to the mobile GPU of the Switch, combined with its processor.
I don't even know if it is possible to build arm code in Visual Studio, to be honest. Why do I mention that? Because Sony also built their toolchain for Visual Studio so that developers can work with their well-known environment.
