That only gets rid of the files after the browser is closed or what not... for anything to be used such as external java script, style sheets or graphics they need to be loaded into the browser's cache. If I clear my cache and visit your site I can grab all of the page's related files from cache. Also, using the "save page as" feature will do that for me and place them in a directory for my inspection later.
If you must see to believe provide me with an url with a page containing your linked style sheet with a 'no cache' meta tag and I'll post your css file.