His first "proof" is a paper by Leonard Sachs in the Journal of European Studies that cast doubt on a detail that had been used to debunk the "Hitler's grandfather was Jewish" theory:
Hans Frank was Adolf Hitler’s personal attorney. In Frank’s memoir, published seven years after his execution in 1946 at the International Military Tribunal at Nuremberg, Frank claimed to have uncovered evidence in 1930 that Hitler’s paternal grandfather was a Jewish man living in Graz, Austria, in the household where Hitler’s grandmother was employed. Contemporary historians have largely dismissed Frank’s claim, primarily on the grounds that there were purportedly no Jews living in Graz in 1836, when Hitler’s father Alois Schicklgruber was conceived. This consensus can be traced to a single historian, Nikolaus von Preradovich, who claimed that ‘not a single Jew’ (kein einziger Jude) was living in Graz prior to 1856. No independent scholarship has confirmed Preradovich’s conjecture. In this paper, evidence is presented that there was in fact eine kleine, nun angesiedelte Gemeinde – ‘a small, now settled community’ – of Jews living in Graz before 1850. The contemporary consensus regarding Hitler’s paternal grandfather does not have a strong evidentiary basis. Other evidence, deriving from earlier sources, suggests that the contemporary consensus may be incorrect. Avenues for further research which might help to clarify the question are suggested.
Sachs in no way says that Hitler's grandfather was Jewish, he just suggests that one of the counterproofs is incorrect. Walid Abdel Hai pretends that this is the "scientific proof" of Hitler's Jewish origins.
His second "proof" is also a purposeful misreading of a non-scientific study that examined the DNA of Hitler's living relatives - some grabbed under less than scientific conditions - and found that he belonged to the E1b1b haplogroup, which is from an ancestor 20,000 years ago and which a percentage of Ashkenaz Jews also belong. So does much of northern Africa and non-Jewish Europe. It is an absurd story, misunderstood by the Daily Mail, and eagerly grabbed by this Jordanian academic fraud.
Hai is an award winning and respected Jordanian academic. Which says a lot about the state of Jordanian academia.
Meanwhile, the excuse for gleeful Palestinian and Jordanian antisemitism is being used by others. Rai al Youm repeats the lie about Zionist collaboration with Hitler, saying, "the Zionist movement is the beneficiary of what was called the Holocaust, and it greatly inflated the number of those killed...Hitler rendered a great service to the Zionist movement." The writer then goes on to the debunked Khazar theory, and throws in the lie that Zionists terrorized Jews of Arab lands to leave even though they were perfectly happy where they were.
Arab antisemites really come out of the woodwork when stories like this surface.
The irony, of course, is that Palestinians (and other Arabs at the time) were definitely on Hitler's side.