If she's 18, at least in the US, I don't think she can get silicone implants anyway (according to the article you linked.) Which leaves LW the very good option of saying, "Let's wait until you're 21 and have more options".

Also yes, Doyin flubbed that caveat! If it's due to pressure from *specific* boys/men, she should absolutely not do it (and also drop said boys/men from her life.) I don't know if he thought that would read that way or what, but 'don't do it if you might want it because of societal pressure' is basically the same as 'don't do it'.