Forum:Twin-Headed Behemoth Semi?

It says that this ruling is Semi-Official. Now what does that mean? Does it mean that that ruling is in effect and as a current full-on official ruling?

''* Using the effect of one copy of "Twin-Headed Behemoth" applies against every copy of "Twin-Headed Behemoth". If you activate the effect of one copy, then you cannot activate the effect of any other copy for the remainder of the Duel.''