True, however he is not inbred as he is close to the F1 generation and even half F2 generation.
Its pretty difficult to find GI Rhinos in Europe that don't stem from Basel's breeding... Nanda & Puri are half-brother and sister, and presumably Zutuma is the full sister of one or other of them(and half sister of the other)
If Hugo goes to Whipsnade, at least the two Nepali females there are entirely unrelated to him. Presumably the female calf will move elsewhere...