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It's kind of surreal to use "Saudi" as the demonym for the people of ArabiaHuh? They use it as a name for "people from Saudi Arabia" and it's a very common use.
"some users of Saudi nationality or descent live outside of Saudi Arabia" --> people who are SA nationals/origin and live outside the country.
>The "Saudi" in the name of the country refers to the royal house, the House of Saud, and I would expect a "person of Saudi descent" to be Arabic royalty, not just any old Arab.
Saudi != Arab. If anything, Arab is a superset (and Saudis, if we talk about the nation state and not the ethnicity, are not all Arabs).
But the main point, is that the name Saud is commonly used for the nationals of Saudi Arabia, not just the royals.
Wikipedia:
Saudis or Saudi Arabians are a nation composed mainly of Arab ethnic groups who are native to the Arabian Peninsula and live in the five historical Regions: Najd, Al-Hijaz, Asir, Tihama and Al-Ahsa;