I took a look at their website. I see they've bought in plants of rothschildianum from Orchid Inn (now out of business), Orchidweb, Paph Paradise, and have some of their own as well. The one that looks most like yours is
Paphiopedilum rothschildianum (‘Paradise City’ x ‘Dark Angel’)
It is not Paradise City x Dark Angel, all the ones that bloomed/are blooming were grown by me to NBS/BS in the Old Continent as we say... and it is not one of them.
That's a very good roth for sure and the parents are of the same style as Paradise City/Dark Angel definitely...
To get it to clump, they need to be kept wet and lots of fertilizer, oversize pots. They clump more readily in rockwool in fact, but even in bark they need a lot of food... High urea content for the nitrogen source, Dolokal on top of the potting mix, and that does the trick. You will get 2 new growths usually out of the old one. The 3rd appears when the 2 others are already growing well, and not all roths do it.