You’re the expert obviously but IMO if a goalie is rigid and doesn’t move a whole lot then he’d better be damn good at tracking the puck. I don’t quite see that kind of vision in his game. At present he’s just a big guy who hopes the puck hits him which makes him another JoJo.
I always state that there tend to be three different styles in goalers; 1. shot-blockers, 2. athleticism/reaction, and 3. hybrid of the two. Kuemper and Annunen are what I describe to be shot-blockers even though I agree with
@Gigantor The Goalie that Kuemper is more moving, but his core characteristic is to get in front of shots. The best goalers in the NHL are what I consider to be a combination or hybrid, these are your Oettingers', Hellebuycks', Shesterkins', and Vasilevskiys' of the league (Georgiev is someone I would classify as a poor man hybrid).
That doesn't mean the other two are super negative, but you're more limited. For example, Lundqvist, Andersen (Carolina), and Giguere are three goalers I would describe as pure shot-blockers or rely on position and technique more so than athleticism. That doesn't mean they are stiff as 4x4, but it isn't their strength. On the other hand, pure athletics are ones I would describe as Varlamov, Fleury, and Grubauer. Not a lot of technique, but were born with crazy Gumby bodies that you can't really teach. That's why you see NHL teams draft athletic goalers higher and more often than shot-blocker since you can build technique, but you can't master flexibility.
The differences between all three are just the amount of talent you have in your particular strength. For example, I would put Rinne in the pure athletic category, but because he had a such high talent for reaction, he became an all-star goaler. The same can be said for Reimer, he's a shot-blocker with not a lot of talent, so he's stuck in a backup role for the majority of his career.