Are you sure you removed the content from the site? Usually your site should be in good standing if you removed the offending content. When you removed the content, did it return a 401 error? If the link still exits, make sure to remove Adsense ads from that particular link.
What I do when i received a notification is to completely remove the page so it return a 401 error. Because if not, the robot would think you still have not removed the content.