The Grounded 1.2 update has landed, with an extra perk, it's now Verified on Steam Deck
On top of that, there is a 25% discount until May 4 (insert joke here)
The biggest issue that prevented Grounded from being verified before was the login issue with Microsoft Xbox, this is now working with a dedicated Keyboard button and controller navigation support.
You can see the full list of updates in the Super Duper 1.2 update here