"In the course of my life I have very often been a prophet, and have usually been ridiculed for it. During the time of my struggle for power it was in the first instance the Jewish race which only received my prophecies with laughter when I said that I would one day take over the leadership of the State, and with it that of the whole nation, and that I would then among many other things settle the Jewish problem. Their laughter was uproarious, but I think that for some time now they have been laughing on the other side of their face. Today I will once more be a prophet: If the international Jewish financiers in and outside Europe should succeed in plunging the nations once more into a world war, then the result will not be the Bolshevization of the earth, and thus the victory of Jewry, but the annihilation of the Jewish race in Europe!"
Socialists actually talk like this all the time. Marx, Lenin, Mao and the rest all proclaimed their intention to literally slaughter the bourgeois before doing so. Kissinger is a Communist. That's why he is willing to make such outrageous statements.
I also suspect your quote would have been taken by most (certainly most foreign) listeners as hyperbole at the time.
Which just goes to show you that civilized listeners can't really hear what their attackers are saying. Their very civilization prevents it.