Shtayyeh, the former Palestinian PM, is right that the Arab Peace Initiative could end the conflict tomorrow if Israel were to accept it. But that's merely a tautological assertion, and while he hints at why Israel hasn't accepted it he doesn't actually say what the US should do to make it happen.
The Arab Peace Initiative is 22 years older, one year younger than me, and has never once been seriously considered by Israel. Why? Because the U.S. has never endorsed the initiative and has never pressured Israel to contemplate it. The U.S. will not do so tomorrow either. We should ask why.