It's about time they ported their Deck performance viewer back to other platforms. It's still a bit touch and go whether it picks up some things. No GPU readout under Linux, for example, as far as I can tell, at least with an Nvidia GPU.
The DLSS stuff is interesting, but it wasn't much of a secret before. They took the way they present it from the generally amazing Lossless Scaling and, if anything, I like that you can now compare their solution to DLSS apples-to-apples. I'm a bit confused about their graph display, though. I'm guessing the red line is supposed to be native frames and green is all frames? That's a bit weird, since the color coding on the text is backwards from that.
As a side note, it's weird and has always been weird that Steam's performance monitor has a way better time picking up apps than Nvidia's on Windows. You'd think owning the drivers would give you the edge, but nope.