Yeah, I figured stuff like this would happen. I'm sorry this is happening to you.
If I just sit here and take time to think about this, I think this is what they should do now, since they already spent money on the coding:
1) Make the rating 18+ to keep the game from being recommended to minors (duh).
2) Keep the coded restrictions they just spent money on coding to keep minors from entering the game and being exposed to adult content, while giving a chance for adults interested in the game to experience a sort of tutorial area to decide if they want to keep playing the game and go through the age verification process (because consent is key and adults should get some sort of sample of the game prior to making their decision).
3) To access the adult content of the game once they've completed the tutorial area, the player must go through a true age verification process, where the player submits a picture of themselves, holding an ID (the ID must have a picture of them on it and a date of birth, duh). Similar to how crypto wallet apps do it, the ID verification data must be deleted within lawful limits and cannot be shared with 3rd parties.
4) The age verification is processed by a REAL HUMAN BEING who will accept or deny the verification (yes ATA will have to hire real employees dedicated to this, because AI is way too unreliable for this process).
5) ATA should spend money on advertising the game to adults and advertise it as a unique 18+ social game (which it actually is), going all in on adult themes, giving more SFW and NSFW options for their adult playerbase, like coding NSFW toggles for the adults that don't want their game to appear too sexual during work (or any other reasons) or catering to their actual playerbase's mature sensibilities by being more risqué in their NSFW content instead of doing nonsense to appear more PG (Second Life does this by having PG, Moderate and Adult toggles for content, so players can find items and locations that cater to them as individuals and as adults. It also doubles perfectly to keep teens out of inappropriate content, since Second Life has an adult side to it and has always had this obsession with keeping a teen rating, my guess is money, but whatever).
Would it be annoying for adults to go through this age verification process? Oh, absolutely, but would it keep minors out more effectively than whatever the hell this is trying to achieve on its own? Yes.
I think that when a game is on the app store, it has a much higher responsibility to keep kids out of its adult spaces, because this generation of kids is way more likely to get their games from mobile stores than any previous generations, so if they are going to go down the "protect the kids at all cost" route, then they better go all in with it. Since PIMD doesn't have separate PG, Moderate and Adult areas that are actively moderated by HUMANS, like Second Life* does, this is even more important.
*I am comparing PIMD to Second Life, because it is also an adult leaning social game and although I wish Second Life was rated for adults on the app stores, at least Second Life has restricted areas and shopping restrictions for unverified accounts and most adult locations kick you out manually if your account is younger since locations are moderated acticely by the playerbase (On Second Life you can see when an account was created and whether it's a verified account by looking at the person's profile).