The CLI has more functionality than the API, so you might have better luck listing all entries that way then looping through the details of each entry if the list doesn’t contain the datetime.

The DFXP file should just be subtitles

The MPD file is most likely the one to work from - I suspect it is set up to reference the local audio and video files. Try opening it in VLC and see if it plays. If so, something like Handbrake should be able to transcode it all to your preferred format.