If you need to clarify that your characters are of legal age....
It's pretty clear this was their marketing strategy from the start. Just play the "we're a victim of evil valve" card and suck up some sympathy pre-order buys.
Reminder that there was about 5 devs + some outside contractors that made amnesia the dark decent. An excellent horror game. Made by a very small dev team.
These guys just suck. And then they want to cry about how it's not their fault they suck.