I don't think that's the reason.
Last season several league champions had already complained that their STH went down (Torooo lost quite a few, and some others).
I don't remeber any BB coming up to say this, but at the time it was discussed that teams taking the heaviest hit in STH were those above 4000. Perhaps someone like jbmcrock who still had a pretty big STH number, or anyone else above 4000 could come up and say how did it go this time.