I think the author’s point is that Haj Amin al-Husseini’s hatred for the Jews predated the Nazi era, although he clearly saw the advantages of joining forces with an evil ideology that went hand in glove with his own genocidal goals.
Netanyahu is also pointing to Jew-hatred as intrinsic to Islam, with the Nazi era incidental to that fact.
That the Palis are & have been completely Nazified since the 1930’s is obvious. Mein Kampf in Arabic is a bestseller in the region to this day.
The twin poisons of Naziism & Islam are totally & inextricably intermingled and will never be separated.
The major German branch was put down in 1945, but its followers found kindred souls and employment among the Arab Middle East states in the post-WW2 years. Now this venomous ideology seeks NBC weapons to carry out its infernal designs. The Western World still cannot rouse itself from its PC suicide pact with the Left and Islam.