I think anyone should be able to be a model. If the person can model it, let them. If they started with a no plastic surgery rule, who knows what other rules would come after? The standards for who can be a model are already too narrow. I wouldn't want to send the message that there's something wrong with people who have plastic surgery, I think people should not care if someone has plastic surgery because it's not your face.
Why does everything have to set a good example?
I hope you are aware that people get corrective surgery for health reasons. Even if they didn't, it still wouldn't matter. People should feel free to make choices regarding surgery and not be ostracized for their choices.
Obviously, they're not referring to people with health problems.
No, actually it's not obvious because they didn't say so or even imply so.