That's a corruption of his vision. His vision was more like Blue Mink's Melting Pot natural phenomenon, rather than a forced migration of people.
en.wikipedia.org
Coudenhove-Kalergi, R. N. (1925). Practical Idealism, English ver. 1.2 (PDF). Trans. Curtis White. p. 30. Man of the distant future will be a hybrid. Today's races and castes will fall victim to the growing defeat of space, time, and prejudice. The Eurasian-Negroid race of the future, outwardly similar to the ancient Egyptian, will replace the diversity of peoples with a diversity of individuals.
Like all visionaries, his vision wasn't perfect, but it bore the hallmarks of peace and an egalitarian society. Quite the antagonist of the likes of Trump and Farage.
I suggest you read the originals rather than the prejudicial corruptions of others, which he was used to. Hitler claimed he had died when he escaped from Germany, and said he was a Jew, he wasn't. They were just pathetic attempts to discredit him.