OKC: agreed in general, just short of the home base, however. Hope you don't mind pointing out the the extra yard.
https://www.revenue.ie/en/tax-profes...udi-arabia.pdf Article 15 (3).
Given the amount of cash involved, it'd be counter-productive to even voice an opinion here. Each must go see a person who understands the implications within the legal framework home.
Just an observation then: Identical wording elsewhere in EU means that the taxes are done in KSA (even if zero) and the passport state only gets the difference up to their rates ONLY from work exercised OUTSIDE KSA territory. What is done inside the Kingdom is not claimable to them. But for instance per-diems from international routes would be.