"Supports" maybe (is it up to date with WebKit security fixes?), but definitely no longer maintains or develops. Safari 6 is not available for Windows. There have been no updates to Safari for Windows in almost a year, and no new feature releases in almost two years.

On that matter, I wonder why they didn't continue to provide security updates for 5.x when they decided to continue support for Snow Leopard, like MS did with IE.