I know very little of how the ad business work, but everything on that blog seemed like "after the fact". Don't they look at the ad first then and approve it?

I know very little of how the ad business work, but everything on that blog seemed like "after the fact". Don't they look at the ad first then and approve it? They make it sound like they maybe run the ad through some automated tests and then just send it out. A decent human approver of ads would never approve an ad that looks like a big green button that says "Download now".