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They apologised after getting criticized¹, but as Mike notes, someone consciously put that text there. Was that some experiment by their publisher? To get young adult readers to get used to such silly stipulations in order to turn it into law later? If I was one of the authors I would be pissed at the publisher² for slipping that in and damaging their reputation.
1: https://www.facebook.com/100063768668342/posts/pfbid02WRJwn8...
2: I am hoping this was not actually put in at the author's behest.