I just googled "download skype for mac" without the quotes and an ad for the mentioned site was the first result. Another non-skype site's ad was second, and the first real result was the expected download page on skype's website. I could see a lot of people falling for that.
If true, Google collected revenue from the advertiser on "Mac" and "Skype" from a company obviously preying on people's level of sophistication. In 2000, claiming naivety would at least be plausible. Today it ain't.