It is not debatable. Palestine is a recognized member so according to the law they have jurisdiction. If these laws have any usefulness if no one will follow it is debatable though.

Since the territorial boundaries of the State of Palestine are, too say the least, disputed, the territorial boundaries of ICC jurisdiction derived from its jurisdiction over acts on the territory of a state party where the state party in question is the State of Palestine is actually a tricky question.

Being confident doesn't equal being right.

I'm aghast as to what people seem to think they have authority on simply because they're using the internet.

There is a real world out there and it is quite different from online echo chambers, to say the least.