How exactly is it absurd? What in common did we have with Russia, before, during, or after the war except for the common goal of defeating Germany? Or China for that matter? Both of whom were allies during WWII.
Following the end of the war, Operation Unthinkable was conceived and contemplated to drive Russia out of Eastern Europe. While eventually rejected it was the catalyst that led to the Cold War with Russia. Who were American allies in that Cold War? Why Germany & Japan of course.
So in reality alliances are formed and changed many times over. In fact, since this expose of Milo was engineered by NeverTrump noe-cons, those now trashing Milo have now opted to form an alliance with NeverTrumpers.