I mean, it's more logical than the vanilla Victorious-Kaiserreich-Helps-the-Whites scenario; after all, why would they help the folks they've been fighting for the past four years? It makes more sense from a strategical PoV; a White Russia would only have one thing to focus on: take back Eastern Europe from the Germans. A Red Russia OTOH would also face the Japanese and the British (who, coincidentally, would be in the german Enemy List too). Wouldn't it be better for Germany to be on good terms with the Soviets so they would focus first on India and Manchuria?