You should be fine. The B-Line is (an admittedly quite good) optional section of black that runs off from the main Red Loop. The blue loop seems to be closed but is extremely vanilla and I doubt you’d be making the trip for that!
So you have the full red loop along with all the optional black bits other than B-Line (ie about 98% of the good stuff). Well worth the visit imo, as trail centres go I like Llandegla (although most of my riding is natural now). If you get bored you can always strike out for Betys-y-Coed and have a crack at Penmachno. One of the closest you’re going to get to a natural trail centre, the short loop is excellent (if a bit wet at times) with some of the best fast, gnarly, technical singletrack descents I’ve done, bar none.