Wow, I had no idea that they said stuff like that on their site. Even though it specifies "PC viruses," the average computer user doesn't understand the distinction. Just last night a relative mentioned how Macs don't get viruses (which I corrected).
Are macs not PCs? Perhaps I'm an average user, but I thought PC stood for "personal computer".
To lots of people (myself included), "PC" means "personal computer" and include desktop and laptops from Apple.
However in the 1980s/1990s, there were "PCs" and "Macs". PC was anything running Windows (etc.) and a "Mac" was from Apple (i.e. a Macintosh). Apple (and many Apple fans) continue to use "Mac" instead of "PC". I've had Apple fans ask me if I use "a Mac or a PC?" (Since I use Linux, I don't know what to say :P)