Abbas: "Palestinians have been under occupation for 63 years"

From NYT, in an interview with Mahmoud Abbas:

We don’t want to isolate Israel but to live with it in peace and security. We don’t want to delegitimize Israel. We want to legitimize ourselves.

All well and good - except for what he said immediately prior to this:

We are going to complain [at the UN] that as Palestinians we have been under occupation for 63 years.

How can one reconcile those two statements? If Israel has been occupying their land since its birth in 1948, doesn't that make Israel illegitimate?

(Somehow, I don't think he was referring to Jordanian occupation.)

The New York Times' Ethan Bronner, as usual, did not ask for clarification. And Mahmoud Abbas remains free to say whatever he wants to whatever audience he wants without fear of someone pointing out that he is a liar.

(h/t Dan)