While material might be removed from it's original site, it might remain in a mirror or some old cache somewhere. Other possibilities might exist. The webmaster of the originating site may have no control over this. Computer and web technology has it's pitfalls when it comes to electronic data.
I don't know much about the Internet, so I'll be brief. I published some articles on web site. A few months later, I didn't want credit for the material I had submittied, so I asked the webmaster to removed my link, and he did. However, when I google the article, I can still find it, but if you go directly to the site, you can't find it because he removed it. What's happening here? Previously, this has happened to me before, but after a few months, I couldn't google the article anymore.
Also, another similar experience. I asked the webmaster of another sight to change my bio for an article I had submitted. He changed my name and info, but when I google the article, it's still under my name. However, when you press the link, the website has been changed. So how can the name already be different on the article, but when I google my name, it hasn't changed. Do these things take time?