Sadly, that is no longer true of the version of OS X released after that was written. Specifically, neither Lion's built-in "screen sharing" server nor Vine Server on Lion works with any of the Windows VNC clients we tried.

When someone used Windows remotely to monitor my OS X Lion desktop in 2012, it was through "captures" (still images) of my screen saved to a shared folder of Dropbox. Specifically, I wrote some code to fork and exec "/usr/sbin/screencapture -C" every 3 minutes.