No actually it's factual history that everybody believes.
Number of books in german, arabic and english about husseini. I don't have list on this computer but an amazon search should come up with a few, a least in english. I don't search arabic books on amazon. The german books, at least two I think are out of print but a library might help get loaner from another library for you. I don't recall reading a book about him in French, but I'm sure there must be a few.
Probably a dozen clips on youtube
A basic search would provide some starters on the subject
Haj Amin al-Husseini - Wikipedia, the free encyclopedia
Haj Amin al-Husseini
During World War II he collaborated with both Nazi Germany and Fascist Italy by making propagandistic radio broadcasts and by helping Germans recruit Muslims for the Waffen-SS. On meeting Adolf Hitler he requested backing for Arab independence and support in opposing the establishment in Palestine of a Jewish national home. At war's end, he came under French protection, and then sought refuge in Cairo to avoid prosecution.
Ties with the Axis Powers during World War II[edit]
Throughout the interwar period, Arab nationalists bore Germany no ill-will, despite its earlier support for the Ottoman empire. Like many Arab countries, it was perceived as a victim of the post-World War 1 settlement. Hitler himself often spoke of the 'infamy of Versailles'. Unlike France and Great Britain it had not exercised imperial designs on the Middle East, and its past policy of non-intervention was interpreted as a token of good will.[119] While the scholarly consensus is that that Husseini's motives for supporting the Axis powers and his alliance with Nazi Germany and Fascist Italy were deeply inflected by anti-Jewish and anti-Zionist ideology from the outset.
Subsequently, the Mufti declared in November, 1943:
It is the duty of Muhammadans in general and Arabs in particular to … drive all Jews from Arab and Muhammadan countries….Germany is also struggling against the common foe who oppressed Arabs and Muhammadans in their different countries. It has very clearly recognized the Jews for what they are and resolved to find a definitive solution [endgültige Lösung] for the Jewish danger that will eliminate the scourge that Jews represent in the world. …
At the Nuremberg trials, one of Adolf Eichmann's deputies, Dieter Wisliceny, stated that al-Husseini had actively encouraged the extermination of European Jews, and that he had had an elaborate meeting with Eichmann at his office, during which Eichmann gave him an intensive look at the current state of the "Solution of the Jewish Question in Europe" by the Third Reich.
Propaganda[edit]
Bosnian Muslim soldiers of the SS 13 Division, reading Husseini's pamphlet Islam and Judaism
Throughout World War II, al-Husseini worked for the Axis Powers as a broadcaster in propaganda targeting Arab public opinion. The Mufti was paid "an absolute fortune" of 50,000 marks a month (when a German field marshal was making 25,000 marks a year),[193] the equivalent today of $12,000,000 a year.[116] Walter Winchell called him 'the Arabian Lord Haw-Haw.'[194]
The Mufti also wrote a pamphlet for the 13th SS Handschar division, translated as Islam i Zidovstvo (Islam and Judaism) which closed with a quotation from Bukhari-Muslim by Abu Khurreira that states:"The Day of Judgement will come, when the Muslims will crush the Jews completely: And when every tree behind which a Jew hides will say: 'There is a Jew behind me, Kill him!".[195]
On 1 March 1944, while speaking on Radio Berlin, al-Husseini said: 'Arabs, rise as one man and fight for your sacred rights. Kill the Jews wherever you find them. This pleases God, history, and religion. This saves your honor. God is with you.