Right clicking and then clicking open didn't work for me, but I did find a solution in the reddit link that you attached. After getting the "cannot be opened because the developer cannot be verified," I pressed cancel, and then opened System Preferences > Security & Privacy > General. Under "Allow apps downloaded from:" there was an option to "Allow PixSort anyway." (I don't remember the exact phrasing). After clicking that I closed AE, and reopened it and the plugin worked!
Thank you for your help! I'm a big fan of your work!
