I'm confused. The article you linked seems to very clearly agree with me:

In terms of performance, the Switch 2 is clearly more powerful than the Steam Deck before we even start talking about cooperation with NVIDIA, DLSS upscaling, and tighter game optimizations possible when developing for a fixed console hardware platform.

I mean, yeah, that tracks and is verifiable. It's a more power hungry APU (although admittedly on a larger node), it has more cores on both the CPU and GPU side, a higher resolution and framerate screen. Storage seems to fall somewhere between the cheaper and more expensive Deck models and, while it has less memory it's also... you know, a console, so there's presumably less overhead and the RAM itself is a bit faster, which is very relevant to APUs. The Switch 2 is built on Ampere, while the Deck is on RDNA 2. Both launched in 2020, but I think it's not controversial to say that Nvidia had the edge on both features and performance for that gen.

It is absolutely true that Nintendo traditionally latched on to older, less performant components paired with hardware investment elsewhere, but the Switch was a huge outlier there. If you consider it against handhelds it stood alone as the single most powerful one. Granted, the Vita was the closest comparison and that was a whole generation behind, but I can't stress enough how outclassed it is against the original Switch. The need to push a TV display from a mobile chipset ended up making the Switch a genuinely beefy handheld.

The Switch 2 is interesting because besides iterating on that requirement it also seems like a very deliberate response to the Deck and PC handhelds. It seems intentionally designed to be competitive against the current set of those. I wouldn't be surprised to find that Nintendo pushed the price and performance up a bit specifically for that reason, frankly. It seems egnineered specifically to not feel outdated at launch, even if it will presumably be outclassed again in a couple of years.

And for the record, I'm not "white knighting" Nintendo. They're famously ruthless, litigious and quirky bordering on unreasonableness. Not white knighting (or grinding an axe against) Valve, either. They're also ruthless and quirky bordering on unreasonableness, although clearly much, much better at PR with core gamers. I am actively hostile towards Nintendo's approach to a number of things (primarily emulation) and to Valve's approach to a number of things (primarily their gig economy approach to game development and their monopolistic tendencies). Not rooting for one of them doesn't mean I'm rooting against either of them, or that I don't acknowledge the things they do well or poorly.