So what is your explanation for all those references going back to 1900 about "six million"?

Here is one suggestion:

Regarding the 'six million' number you should know the following: In the Hebrew text of the Torah prophesies, one can read "you shall return". In the text the letter "V" or "VAU" is absent, as Hebrew does not have any numbers; the letter V stands for the number 6. Ben Weintraub, a religious scientist, learned from rabbis that the meaning of the missing letter means the number is '6 million'. The prophesy then reads: You will return, but with 6 million less. See Ben Weintraub: "The Holocaust Dogma of Judaism", Cosmo Publishing, Washington 1995, page 3. The missing 6 million must be so before the Jews can return to the Promised Land. Jahweh sees this as a cleaning of the souls of the sinful people. The Jews must, on the return to the Promised Land, be clean -- the cleaning shall be done in burning stokes.

Here is a video on the subject of Jewish Gematria: https://archive.org/details/JewishGematriaTheMysticalNumber6000000

So what is your explanation for all those references going back to 1900 about "six million"?

Here is one suggestion:

Regarding the 'six million' number you should know the following: In the Hebrew text of the Torah prophesies, one can read "you shall return". In the text the letter "V" or "VAU" is absent, as Hebrew does not have any numbers; the letter V stands for the number 6. Ben Weintraub, a religious scientist, learned from rabbis that the meaning of the missing letter means the number is '6 million'. The prophesy then reads: You will return, but with 6 million less. See Ben Weintraub: "The Holocaust Dogma of Judaism", Cosmo Publishing, Washington 1995, page 3. The missing 6 million must be so before the Jews can return to the Promised Land. Jahweh sees this as a cleaning of the souls of the sinful people. The Jews must, on the return to the Promised Land, be clean -- the cleaning shall be done in burning stokes.