Plone doesn't do that by default, no. But defining CMS as something that out of the box generates static content? I don't get that. First of all caching is a much smoother solution, and secondly, static HTML-file generation tend to break down if you do personalized content. And thirdly, not one single major CMS is ever sold out of the box. So saying that Plone isn't a CMS because it doesn't do this out of the box simply makes no sense.