That was my thought too.
Oddly, when I inquired on the SIDLuxe with Vorsprung, they told me it was not tunable at all. Might be different if they go back to the factory? I own the SIDLuxe and it is by far the least user tunable shock I have owned as well - only a rebound adjuster, and the range is so wide, only about 2 clicks of 11 are actually usable.
The Deluxe actually has low speed compression adjustment as well. I don't know if the rebound range is as broad, but I was contemplating buying to to see if it was a little more tunable than the SIDLuxe.
RockShox just released their 2023 range today as well, so who knows what changes were made to the Deluxe!