I have no idea. But it is not a defence against a crime to say well someone else did it too. That wouldn't even wash in most playgrounds.
So you agree that that person has committed an equivalent (or more accurately, worse) crime. Good that we can agree on something.
Their crime is worse because it threatens violence and is abusive, unlike Jennifer's stickers which were just stating facts.
But the police have failed to act on complaints about those threatening and abusive posters and stickers which have been flyposted by a male, and have chosen instead to persecute a disabled woman posting stickers which state facts. I;m sure you'll also agree that this is quite discriminatory.