I think I found what they are using between the hose and the 90.
https://a.co/d/buF9UZdThoughts? It has the 2 nubs for the bayonet on the 90 to attach. The 1 inch opening is offset like the photo. But not sure how a macerator hose would attach to a threaded (garden hose?) connection,,, unless it is modified, or there is a slightly different version available. This was the closest I could find.
It's a shame the stick is positioned where it is in the photo as it blocks the most important piece of the puzzle.