The Israeli central bureau of statistics is not an internationally accepted authority on the political status of Ariel. To make such a reference is only one step up from quoting the Bible! You might as well go to certain websites and buy a piece of real estate on the Moon. You'll get a nice certificate but its legality will be zero.
Second rocket fired from Gaza explodes inside Strip (Haaretz)
from the article: Spain contest bans Israeli team affiliated with West Bank college