Tried various versions of proton and launched the game various ways through protontricks.

Launching the game executable directly

Game includes kernel level anticheat module that --- once failing to load(as shown by proton logs) --- either intentionally or unintentionally causes MGLauncher to display the vague error message of "no system resources"

Developers publically acknowledge the lack of steamdeck/proton support. Allegedly planned for the future but not being worked on.