RE: Heidi's main site - Yes, it does need updating
For the benefit of others, that CNET link doesn't take you directly to where you need to go. The one that CNET supplied is missing part of the whole URL that goes directly to the Eraser webpage and takes you to the main Heidi Computer site, instead. Notice the difference between the URL CNET gave and the one I gave? On the site that CNET gave simply scroll down to where there are links to Heidi's Software Products listed and click on Eraser Download. That will take you to the site that I gave. That is where the information about what OSes are supported is updated. But, you are absolutely correct in that they do need to update their information on the page that CNET gave.
Furthermore, I know for a FACT that Eraser does work on Windows 7 because I've installed it on Windows 7, myself, and it does work just fine.