Hi,
I would describe Bario as being locate at a highland plateau, and the N. veitchi there grow as terrestrials. I have only seen one plant "climbing" a tree there and it was more draped on an almost horizontal tree stem. Batu Lawi is one of the mountains on the plateau, as is the closer neighbor Batu Buli. I have climbed the latter, but didn't see veitchii, but it is supposed to grow there too, as well as the trail towards Batu Lawi. According to the guide it grows in another habitat, not the cloud forest, were you could find lowii, chaniana and tentaculata. Maybe a kerangas type habitat fits it better, like the Bario type only at higher altitude. The pics I have seen show them growing up high rather straight trees. In the mossy forest I saw, the trees were shorter, gnarlier and covered with thick moss. That might explain their absence there.
Regards,
Christer.