This statement is based on a myth that has spread since 9/11. Osama bin Laden's hatred of the U.S. was based entirely on the U.S. military on the Arabian peninsula. He never mentioned the Palestinians until his last video when he called for Israel to withdraw from the occupied territories. In doing this he wasn't motivated by any concern for Palestinians, but by his desire to win some friends among other Arabs. You see, many Arabs who might have supported him in principle actually despised him after they learned that most of the young men who took part in his great jihad on 9/11 didn't even know they were on a suicide mission.
On September 11th, the poor, downtrodden Palestinians were heavily outnumbered by the male children of wealthy Saudis on those four hijacked flights. In fact, I believe the count was 19-0 in favor of the Saudis. Kind of odd that there wasn't a single Palestinian among them, isn't it?