My first reaction to this was that someone made a mistake somewhere. They saw the game title and the front page, assumed it was a porn game due to it's rating or whatever, or made some other assumption that doesn't hold up to even cursory research, which would confirm the game's had two releases, the former of which has 100k+ reviews on Steam, and the second of which was even physical on consoles.
But no. The post mentions it was pulled due to a TOS violation with regards to its depiction of 'sensitive themes'. That would seem to suggest the problem lies with the game depicting suicide or just its other depictions of mental health problems in general. It could still be a mistake, in that they researched it to the point that they figured out it was dealing with those themes, but not to the point of figuring out it's a successful darling of a game. This seems rather unlikely.
Either way, fact that it's even possible to pull from the store, several months after it was first published without issue, without at least having a chat with the publisher first, is worrying.