Hello.
I have the same issue on OsX Catalina but with 8.3.0.3422 client and the master Trinitycore branch.
I have the Articum 8.0.1.28153 launcher (latest available on the site) in _retail_ folder next to World of Warcraft.app (outside of _retail_ folder gives "Please copy the launcher to your WoW folder." or if I place it insite World of Warcraft.app/Contents/MacOS) and also updated the path in command to /Applications/World\ of\ Warcraft/_retail_/ but I still get the Exceptions as DarkWOW mentioned.
Any hints on how to get the mac client to connect to trinity server are appreciated.
Thank you.