I saw the information from the developers here: New Plex Media Server movie scanner and agent preview - #517 by chrisallen.
This also seems to disprove that: New Plex Media Server movie scanner and agent preview - #520 by chrisallen
Did something change since this forum post? I’ve seen Plex correctly identify shows this way that it used to struggle with. Rebirth: りばあす - TheTVDB.com is a good example, it often matches https://www.thetvdb.com/series/rebirth