Since the trend is to jump up and make the brilliant observation that we should be skeptical, let me point out that even if they don't really want to mean it, the fact that they're doing it is very, very good news. It will cut deeply into Muslim and Arab politics and social perceptions, and pressure them to change their stance vis a vis Israel.
I now return you to your regularly scheduled skepticism.
I think this shows how smart the Administration has been to lay low this past week and let all the nutjobs overplay their hand. And like you said, even if the Palestinians don't really mean it, at least they are on the record as having said it. That sounds like good news to me.