The original article for this news even states that this is in relation to underage looking female characters from JPN games.
Sony officials said the company has grown concerned that its global reputation could take a hit from sexually explicit content sold in a few markets. A big worry is software sold in its home market, which traditionally has had more tolerance for near-nudity and images of young women who appear to be underage.
So basically they're just officially announcing the policy they enacted like 7 months ago? lol