I don’t know why that book is seen as controversial, Jews are pretty open about their desires. The Talmud, Chabad Lubavitch, and Halakah are all part of mainstream doctrine in Jewish society, and they all call for a future where goyim will form the slave caste.

well, if the true goal is to destroy Caucasians as a definable race, it pretty much is brilliant.

https://en.wikipedia.org/wiki/Richard_von_Coudenhove-Kalergi#Views_on_race_and_religion
“In his book Praktischer Idealismus (Practical Idealism), he predicts Jewish supremacy after the fall of European leadership and the subsequent disolution of all other national ethnicities:[42]

The man of the future will be of mixed race. Today’s races and classes will gradually disappear owing to the vanishing of space, time, and prejudice. The Eurasian-Negroid race of the future, similar in its appearance to the Ancient Egyptians, will replace the diversity of peoples with a diversity of individuals. ...”