I rode Gorlech about a fortnight a go and there were no actual closures and apart from a few 100m of fire road that's a bit churned up and a 200m section of flat singletrack, it was all open and fine!
I can't see why it's actually closed but I'm sure I'll get flamed too by the sounds of it.
Allow 2 hours for each if you're of reasonable fitness and ability. It's hard work riding both back to back though, although it's only 40 something km, compared to other trail centres it's a lot of climbing. I think it's 725m for black and something like 1200m for the red.
Enjoy, it's a fun place to ride!