Somehow, some way, Mac OS drivers have appeared as a download option for a Dell Latitude X1. How many times do we have to tell you Michael Dell: You can't sell Mac OS X, no matter how often or how badly you wish to sell an operating system that's made for this century. Besides, trying to sneak it onto your site is just bad form.
If you want to see this interesting quirk for yourself, check it out at Dell's Driver and Downloads site. As of this writing, you can snag your own 'Mac OS' drivers for a Latitude X1.
This most likely is nothing more than a quirk of Dell's site, as we (thankfully) haven't heard of Jobs changing his mind or seen reports of the sky falling. You can go on about your business.