At 17:51, you incorrectly state that each person heard on the track should have their own Artist tag.  Artist is a singleton tag, according to the specification.
https://age.hobba.nl/audio/mirroredpages/ogg-tagging.html

Each performer should have their own PERFORMER tag, and the ARTIST tag would simply summarize all PERFORMER and ENSEMBLE (that's a band name, or orchestra, or group, etc.) tags, for dumber software/hardware that can't easily show them separately.