Hello, I think you are correct. This is the only message that I have regarding "processing date" in my ECAS (sorry Goforhope if this is not what you were asking, in terms of "processing date").I think this processing date is for your AOR.
I actually never got an AOR letter lol. I think many of us March applicants didn't get an actual AOR for some reason. Tech glitch? It's okay about this. My application has been in progress and going through the steps even so.