This indicates that an artist appears on a music video, but doesn’t actually perform on the audio track.
Does that exclude only vocalists and instrumentalists or also e.g. producers?
What if the song is credited to a group and some members don’t perform, but still appear in the video?
What if an artist appears in a video and performs e.g. additional background vocals just for the video version of the song (but the audio is never released just as audio)?
Do only artists count that appear on newly recorded video material or also archive videos or even just pictures that appear in the video?