"De facto" and "de jure" are two different things. I already provided a link where you can read for yourself the letter of the Agreement you signed.
From my own direct experience, I can tell you that "Square Enix staff" seems to include the staff as a whole (e. g. no criticizing "the devs") as well as individual staff members. Criticizing FINAL FANTASY XI itself is implicitly permitted, but anything more "meta" than that (such as Square Enix's publishing or staffing decisions, which are external to the game itself) is not allowed in these forums.besides that, if you have a real problem with a staff member