A lot of people are saying this but I'm skeptical. First, they released Little Witch Romanesque completely uncensored 8 months ago. Most of the h-scenes in that game are you taking advantage of little girls.
Second, when someone on the announcement page complained about the censorship JAST's response was that some of the staff had threatened to quit because they personally were offended by it. No mention of legal issues anywhere which would have been the first thing they said if it were true.
What's even more puzzling is that there were no issues at all when they translated the rape, scat, bestiality and dismemberment present in Starless. Granted, some of that content was removed as well but it was because those are extreme fetishes rather than controversy and the patch was bundled with the game.
So apparently in the last 8 months JAST made some questionable personnel changes involving people who are fine with rape but are outraged at consensual sex with a minor.