You didn't seem to understand the argument, as the person you are responding to is essentially saying "this is already illegal, and that's where that should be solved"; the issue is that in addition to making it illegal, people also seem to believe it should be impossible, which requires not just "people can look at the ad, decide it is false, and then take the person to court and make it go very very badly for them" but also "Facebook should somehow manage to block these ads in the first place, preferably as immediately and automatically as possible", which goes above and beyond "it is illegal" and really requires the "API" version of truth.