I am the one that actually mentioned this on various threads yesterday. So just to confirm it is supposed to open at rope drop, but it rarely does. Just to say again on this thread that I asked a number of cast members and they said that within the last two months, there were many days where they have experienced technical difficulties and lines have backed up. They also told me in the future that if you are lucky it will open at rope drop, but they said its not the best idea to count on it. TT does strike me as a ride that will have many breakdowns within the day actually, so I can see why.
So anyway if you plan on doing TT at rope drop, always have a plan B in place. If you are lucky Plan A will work, but never count on it 100%. If you all ride the single rider lines, then there is probably no problem at all, but I am not a fan of breaking up and using the SR lines unless I am actually the only rider.