Crew was asked to fly it to Dubai but elected to go to HKJK instead.
Not sure about the EK fuel policy but as an experienced 330/340 pilot I can say that after loosing one donk during the climb you don't have the fuel to take it all way to destination (assuming DXB with AUH/SHJ as alternate).
ADD or Sana'a would have been within reach but WTF wants to go there - so NBO sounds like a good idea to me (or why not JNB? Plenty of SAA 340s there...).