The Palestinian National Charter was adopted on 28 May 1964,[5] establishing the Palestine Liberation Organization, in (east) Jerusalem along with another document, variously known as the Basic Constitution, Basic Law or Fundamental Law of the PLO, based on an earlier Draft Constitution. The Charter is concerned mainly with the aims of the Palestine Liberation Organization, while the Fundamental Law is more concerned with the structure and procedures of the organization.
The 1968 Charter also removed the 1964 Clause 24 which began, “This Organization does not exercise any territorial sovereignty over the West Bank in the Hashemite Kingdom of Jordan, on the Gaza Strip or in the Himmah Area.” That is to say, the Charter in its original 1964 form made no territorial claims over the West Bank or Gaza.
In 1964 the PLO was fighting Israel to liberate Palestine and that Palestine did not include Gaza or the so called West Bank. In other words to conquer Israel to attain Arab unity and the charter states that they must be Palestinians first to attain that.
Hamas had the same objective on 10/07 and the Arabs fought 2 wars subsequent to that (1967 & 1973) to get to that objective. in 1920 the League of Nations did not call anyone a Palestinian neither did the in UNGA181, UNSC247, in the peace treaties with Egypt or Jordan
Yet you, the UN, EU, ICC,ICJ call them Palestinians.