Interesting. Is this true?
True.
Sure--if you believe Hitler was a reasonable guy who just got caught up in a Palestinian's wish list. Oh, and if you overlook Mein Kampf.
And if you ignore the fact that the "final solution" began in earnest July 1941 in Lithuania, five months before the Mufti's 90 minutes meeting with Hitler, then sure this is true.
According to "other" historical accounts, the Mufti met with Hitler (and Mussolini) to support Hitler's final solution in exchange for their support of an independent state.
The systematic murder of six million European Jews was the fulfillment of Hitler's hatred. While others supported his actions, the actions from start to finish were Hitler's.