oh, I see. the article you refer to as wrong was "Updated 04/18/2013 06:46 PM" and now states:
"Registered Guest accounts have been put in place to allow members to:..."
"5. Post messages on the Ancestry Message Boards (and otherwise participate in the general Ancestry Community)."
I guess they changed it in April to reflect that you can use the Ancestry boards that would be why I did not see what you were referring to.
Good! Looks like they fixed the error.