I'm quite fluent in reading ID3v2 from hex 
It seems like there is no ID3v2 frame which indicates this flag. It seems for ID3v2 (i.e., MP3 files) they determine to show the movement based on – again – data that is only stored in iTunes' internal database.
This I cannot do (yet) as I cannot know how they'll implement this.
Kind regards
– Florian