I don’t think it’s possible to filter the trending games that way, but you can filter the all-time highest rated games that way by using the “Platforms” filter in instant search: https://steamdb.info/instantsearch/?refinementList[oslist][0]=Steam Deck Verified&refinementList[oslist][1]=Steam Deck Playable
It also has an option to filter the search by year(s) and by number of ratings/followers, so you could select the current and/or previous year to see what has been trending well-received and popular in the (relatively) short-term.
Through proton, yes. The game has always worked with anti-cheat disabled (so no PvP multiplayer), but proton-compatible anti-cheat has been supported since early April, so all multiplayer functionality has worked since then.
This article is referring to a recent MCC patch that broke proton anti-cheat for about a week, thankfully it’s fixed now.
That’s nice, although somewhat different than what OP linked. I think the filter you linked will completely remove shorts, where the extension OP linked (Youtube Shorts Block) will instead convert shorts into a normal video, despite the misleading name. Although I think the extension has an option to completely block shorts too
These don’t exactly “fit in” with the rest of the list, but on Deck I’ve personally had a blast with CarX Drift Racing Online and the Sonic &ASRT Collection