Not to be obtuse, but without instructions and based on the other cable for my FTM-500d, I put the single 3.5 to the Digirig, the RJ45 to the Mic and tried the other 3.5 attached to that RJ-45 to the speaker.
My radio stayed in a PTT mode and would not stop.
Your diagram unfortunately is lost on me (and I’d say large number of other Hams who are not EE’s).