Have you read any of the definitions?

Because if you did, you’d realize “as practiced in South Africa” is not a quote found within the entire Rome Statute. Nor is it in Article II of the Apartheid Convention. In the Rome Statute, you can find the Crime of Apartheid listed in Article 7, 2. h) as the following

“The crime of apartheid” means inhumane acts of a character similar to those referred to in paragraph 1, committed in the context of an institutionalized regime of systematic oppression and domination by one racial group over any other racial group or groups and committed with the intention of maintaining that regime

In the Apartheid Convention:

Article II then lists specific inhuman acts that committed in this context amount to the crime under international law of apartheid, ranging from violent ones such as murder and torture to legislative, administrative and other measures calculated to prevent a racial group or groups from participating in the political, social, economic and cultural life of the country and deny them basic human rights and freedoms.

Unless you meant to reference Article II of the ICSPCA, which lists the crime of apartheid as the following

the term ‘the crime of apartheid’, which shall include similar policies and practices of racial segregation and discrimination as practiced in southern Africa, shall apply to the following inhumane acts committed for the purpose of establishing and maintaining domination by one racial group of persons over any other racial group of persons and systematically oppressing them:

Every, international definition of Apartheid is about the inhumane acts for the establishment and maintaining of an institutionalized regime of systematic oppression and domination. That’s what they are talking about “as practiced in South Africa” not your made up definition.

The defining policies of Apartheid are overwhelmingly present in Israel, for all three of the international definitions of Apartheid.