Welcome to the Bruji forums.
I presume you are talking about Export XBMC which is now known as Kodi.
Your are correct the facility; Movie -> Plugins -> Export XBMC has gone. I am presuming that is because DVDpedia 6.* is written using 64 bit code and DVDpedia 5 is 32 bit code. That means that DVDpedia has to assume that your Kodi player is the latest version for at least macOS 10.14 Mojave and better still the latest macOS 10.15 Catalina, which will ONLY run 64 bit code programs and App's. The latest Kodi v18.5 "Leia" 64 bit.
Whether Conor will re-include Export XBMC, I am not to sure. There is lots of other work still to do on version 6.
Now having said all of that have a look at this old post:
.nfo export for XBMC catalogingJust remember the resulting file suffix for import into Kodi is .nfo