A steam deck and backbone are two completely different devices. A steam deck is a handheld pc and a backbone is a streaming only device.
He would be able to play the games you listed on the steam deck plus he can setup remote play on the steam deck to play his PlayStation 5 games.
Another option you can look into is a PlayStation portal, this is very similar to the backbone except it can only stream ps5 games, it would be a step up from his backbone and cheaper than the steam deck.
But overall, I think you couldnt go wrong with getting him a steam deck because it sounds like he would be able to play all the games he likes with it plus he can download the games to the steam deck and not have to worry about streaming the games over WiFi with the other two devices.
A steam deck and backbone are two completely different devices. A steam deck is a handheld pc and a backbone is a streaming only device.
He would be able to play the games you listed on the steam deck plus he can setup remote play on the steam deck to play his PlayStation 5 games.
Another option you can look into is a PlayStation portal, this is very similar to the backbone except it can only stream ps5 games, it would be a step up from his backbone and cheaper than the steam deck.
But overall, I think you couldnt go wrong with getting him a steam deck because it sounds like he would be able to play all the games he likes with it plus he can download the games to the steam deck and not have to worry about streaming the games over WiFi with the other two devices.