The monarchy aspect is a red herring here. The properties in question were granted to the family long after the abdication. The soviet confiscation had little to do with the fall of monarcy in this case

You're totally correct that the properties in the article were granted after abdication, but I'm not in favor of the large amount of property returned to them after WW1.

And in regards to Soviet confiscation in Czechoslovakia, I would argue that the Communist revolution in Europe is related to the fall of the Monarchy, and when Communists come to power it makes sense that they would seize the land of nobles (even those from other countries).

Win wars and wealth, lose wars and wealth.