I agree it should probably say "Whonix - A Linux Distro for..." Minor detail, though.
For others reading, a new OS for anonymity would be something like removing identifiers from and integrating Tor with seL4 (or Fiasco.OC), Genode, EROS, ExpressOS, or Redox. Key components of these don't make up a whole OS but could be with specific tech and a UI.