The RSA is just grandstanding; Israel is not engaging in genocide in Gaza. It is making some effort to spare civilians and provide supplies. It would be engaged in a far different kind of war if it simply wanted to kill as many Palestinians as possible.
However, some members of the cabinet clearly want to engage in ethnic cleansing, and it is perfectly possible that the government as a whole agrees with that, without admitting it to the rest of the world. The evolving facts on the ground thus far are consistent with my hypothesis.
Ethnic cleansing isn’t on the same moral plane as genocide–the lowest possible–but it’s on the way. Call it a lesser included offense.