Xbox Game Pass for PC is an incredible value, even with the caveat of having to run windows (which sucks so bad). That’s always my top rec for PC gamers.
Elden Ring is still my number one game. It’s awesome and will run great on your new PC as well as your deck. It’s also got a lot in common with your listed games.
Grounded is a great game as well! It’s a reasonably difficult survival crafting game (like Subnautica). Same goes for Return to Moria.
Can he instead just stick a gun in his mouth?