This is a late reply, but I am also working on a data export and ran into this issue.
If you export to .enex from v10 these old "auto-titled" notes have this in the metadata.
If you export to .enex from v6, the same note has a title in the metadata.
If you run your export from v6 instead of v10, your notes may export with the "auto-title" intact.
I'm going to test this with YARLE and Obsidian.