Seems like Dubai has 4 billion barrels of reserves [0]. Not as much as they once did and much less than Abu Dhabi. But still quite a few years worth of oil left.
[0] https://en.wikipedia.org/wiki/Oil_reserves_in_the_United_Ara...
[0] https://en.wikipedia.org/wiki/Oil_reserves_in_the_United_Ara...
https://en.wikipedia.org/wiki/Economy_of_the_United_Arab_Emi...
and Refined petroleum 15%
If you want to see an Arab country that has run out of oil, look at Yemen.
So aren’t they a better example of never oil rather than once had oil?