After a long time of hesitation (and checking it on the vBulletin site), now I dared click on it. Then I got a "wizard_hu_ you do not have permission to access this page" page, which was not exactly what I expected.
(I am not sure who sees such button, but I have a "Promote to article" command available for every single post in the DiBo regardless of being moderator on the given board or not.)