Eh I wouldn't be so fast to believe that. Anyone can take 'credit' for this until something official.
So far the sanest explanation seems to be the one where it's about games that have explicit content that goes against Steam's ToS unlockable with patches, where the explicit content/assets are still delivered with the 'censored' version... just locked away instead of the patch actually including the explicit assets.
I have no idea if this is true for all 'targeted' games so I dunno.
it seems all over the place, looking at Hektor's picture. bear in mind, Valve personally approved some of those games. If it is about underage characters, Valve was fin with it for years....