Let's give OP the benefit of the doubt and assume they don't mean to imply OS X users are inherently or on average less tech-savvy or intelligent than Windows users, because that's ridiculous. From http://flowingdata.com/2011/04/26/mac-vs-pc-people/:

> Mac people are 21% more likely than PC people to consider themselves computer-savvy gearheads.

> 54% of PC people have completed a four-year college degree or higher. The same can be said for 67% of Mac people.

Obviously this is "just" a survey, but it's one with 388,000 users participating, and I haven't seen any other surveys or research that concludes the opposite.

So, let's assume their reasoning is that there are more people switching from Windows to OS X than the other way around, that these people are not very familiar yet with their new OS, and that these OS X users will thus search more basic "how do I do X?" queries than Windows users, most of whom have been using the OS for years. Makes sense to me.