NonSteamLaunchers was removed from the Decky Plugin #SteamDeck store recently, so we followed up with the teams and got official statements as to what happened:
https://steamdeckhq.com/nonsteamlaunchers-plugin-removed/?utm_source=dlvr.it&utm_medium=mastodon
@steamdeckhq
#Lutris has worked fine so far...
Lutris works in game mode.