That's not a generational leap, according to the leaks the device is a mild leap in actual power, the screen is even still 720p. DLSS is a nice feature but it will just clean up the image on a TV screen, it won't magically make the Switch as powerful as even a base PS4.
If it does support DLSS we need Tensor Cores and thus a completely new chip set with a new CPU, GPU and RAM. It will be an all new system internally.
If the majority of Switch game releases continue to get released as the same cartridge for Switch and "Switch Pro" after the "Pro" releases, they they are the same family of console.
I'm talking this being released for purchase and play on both Switch and Switch Pro as a single software release for all available Switch console models:
as opposed to the separate software releases that we traditionally see for cross-gen games:
I know the PS4 disc plays in the PS5 with an additional download. But they are still separate software releases for separate gen consoles. The PS4 version was designed specifically for the PS4 console, and the PS5 version was designed exclusively for play on the PS5. Both console versions released on the same exact day. I do not think you will see 2 separate Breath of the Wild 2 releases, with one being for the Switch and Lite, and a separate release stating it is for Switch Pro. If the majority of the Switch library continues to release as a single standard software release for play on whatever model of Switch the user owns, then the Switch and Switch Pro shouldn't be counted as separate Nintendo generations. The same as the PS4 and PS4 Pro sales were not counted separately. If they had, we wouldn't be talking about 115m PS4 lifetime sales, or 50m XBox One.