Not true. The Mandate called Palestine a country many times.
The status of Palestine and the nationality of its inhabitants were finally settled by the Treaty of Lausanne from the perspective of public international law.
Drawing up the framework of nationality, Article 30 of the Treaty of Lausanne stated:
Henceforth, Palestinian nationality was first founded, according to international law, on 6 August 1924. And “treaty nationality in Palestine runs from that date.”
139 The Treaty of Lausanne had transformed the
de facto status of Palestinian nationality into
de jure existence from the angle of international law.
The automatic,
ipso facto, change from Ottoman to Palestinian nationality was dealt with in Article 1, paragraph 1, of the Citizenship Order, which declared: