you have concerns w/ the law saying you can't do something until you're age "x", and then someone doing that something on the day they reach that age?
The fact you're choosing this hill to die on is beyond strange.
I have a problem with adults being supportive/advocating children with aspirations of (of their own, or pushed upon them) going into sex work once they're of age.
As for the law, it absolutely can be flawed, but since you want to argue it to the letter you might find that there absolutely are legal issues with what I've described.