But is there anything that suggests that the Switch 2 is actually going to use this particular chip?
Yes. Since the Nvidia hack, we know that T239 is Drake, the chip ascribed to the NVN2 API (NVN 1 was the OG Switch). This isn't from clout chasing "insiders", it's actual info from Nvidia themselves, even though it was obtained through illegal means.
By the time Switch 2 releases and it could be more powerful than the Deck, my money is on Deck 2 either having just been released or about to be. And it will blow the Switch 2 out of the water.
This is not a given if the Deck sticks with an x86 architecture rather than ARM, and if it lacks features such as DLSS. Even though the next Switch will probably only use DLSS 2.x, it's still a huge equalizer.
The CPU of the next Deck will however run circles around that of the next Switch, but it's less relevant in games as very few fames would make use of it.
To complete my message above, the fact that T239 is now referred to in the linux Kernel tends to indicate that Nvidia also plans to use it in another consumer product, probably a Shield 2; same as the tegra X1 was used in the first Shield.
I used to believe that the next Switch would be 2024; I'm not so sure now, it could realistically be released next year I guess.
that's a big jump.
the X1 has 256 cuda cores right?
let's assume it's the same clock speed as the Switch which is 768mhz docked.
at that clock speed this chip would have ~2.36TF peak performance.
the Switch in docked mode reached 0.39TF as a comparison.
2.36TF is a good chunk above the PS4, and a big jump from the Steam Deck
let's say they clock it higher in docked this time, let's say Nintendo uses the max clock that the X1 can support, which is 1267mhz
in that case the docked performance could get to 3.9TF, quite literally on the doorstep of the Series S
I believe that Nintendo will be very conservative when it comes to clock speed and I expect them to run similarly to the OG Switch.
2.36TF docked is still excellent, mind you, and DLSS could allow this machine to approach the PS4 Pro in terms of in game performance. Still a bit below Series S, still largely below a PS5, but close enough to both to receive gimped downports, probably of better quality than those received by the OG Switch from PS4.