It wasn't about ice time availability, Elmer wasn't ready. He started out on the third line, not the 4th.
Game 2: 16:47
Game 12: 9:39
Gamelogs for Elmer Söderblom for 2022-23
www.hockey-reference.com
Remember, the Wings sucked last year. He could've had plenty of ice time if he deserved it, and taken it away from the 4th line from someone like Erne. Elmer's defensive zone play was atrocious (see first 12 games), and he needed to be sheltered with O zone starts (58.7%). Worse yet, he was setting his linemates to get Nielsened with his hot potato passes into traffic. Somebody would have gotten hurt eventually.
Raz should've stayed in GR until he fixed his skating but he had a hot start in GR in 20-21 and got called up. It's not a big deal because he was able to fix his skating while with the Wings and the team would have sucked anyways with or without him. But it's really rare for a player to improve their skating that drastically while in the NHL.