Yes! To keep tabs, I made a lightbox on 21st March of my S+ files - there were 201. Just now I called up that LB, put the tab to , and there are 170.
I don't pretend to understand the criteria for demotion. Some which sold a few times as S+ have been demoted, others which have never sold are still S+.
OTOH, the 673 I put into a Lb marked 'Go to Main', and asked for them to be demoted when they asked for this back in March are all still S.
Does anyone have a clue what goes on there?