GeForce NOW announces support for Steam Deck, Apple Vision Pro, Meta Quest and Pico mixed-reality devices; plus 'DOOM: The Dark Ages' and 'Avowed' are coming to the cloud.
That's the current setup for playing Geforce Now on steam deck/linux. The app announced in the news post will be a native app, not just kiosk chrome wrapper. They also mentioned it will support HDR which currently isn't possible with the kiosk chrome wrapper.
I bet that's what they'll be doing for the announced "native" app, so Chrome a stop-gap for the beta and the final release will have an integrated web renderer but the actual game delivery by still just opening the website.