Estimates place the total number of people killed at 10 Million, 6 Million of those were Jews, with the remained belonging to the groups that you itemized make up the balance.
Victims Killed Source Jews 5.9 million
[29] Soviet POWs 23 million
[30] Ethnic Poles 1.82 million
[31][32] Roma 220,000500,000
[33] Disabled 200,000250,000
[34] Freemasons 80,000200,000
[35] Homosexuals 5,00015,000
[36] Jehovah's
Witnesses 2,5005,000
[37]
You state that the numbers were exaggerated, but even if those numbers were reduced by half the end result would be that the Jewish were the ones that primarily suffered from the Holocaust, with Soviet POWs (being soldiers of a state that Germany was fighting) and Poles making up the majority of the balance.
And besides, the people that you are quoting are expressing their opinions, not actual facts. Their opinion is that Israel is an illegitimate government. Good for them. They can time travel back to the 1930s - 1940s and talk to Winston Churchill, and tell him that they do not want their own state.