When and how was it censored?

The quotation is Albert Speer's quotation of Hitler, from 'Inside the Third Reich'. Hitler was discussing the potential of an Islamicized Germany, if the Battle of Tours had been lost in the 8th century. He indicated that Islamicized Germans would have kicket out the racially inferior Arabs (and others), and would have benefitted from the superior 'Mohammedan religion' in much the same way the Japanese had benefitted from a superior religion that included their willingness to sacrifice themselves for their country.

More info: https://www.jstor.org/stable/43965266