So if I understand the new configuration of Armory is that Bitcoin Core is no longer used or needed, it has been replaced by ArmoryDB.exe? Does that mean I can uninstall the Bitcoin Core app?
No, that is incorrect. Armory still uses Bitcoin Core. ArmoryDB is just another layer of Armory (the part that interacts with Core) abstracted into its own binary. This is to allow for litenode functionality in the future.