I don't read the line, "The victory of Fascism in a number of countries is only an episode in the long series of struggles over the problem of property," as Mises saying Fascism preserved private property, especially since the next victory over it would be the Communists, and ultimately a struggle of ideas. Mises,
Liberalism, wrote "The program of liberalism, therefore, if condensed into a single word, would have to read: property, that is, private ownership in the means of production." And I don't think he missed Fascism or Communism as being antiliberal.
I do believe he was fascinated with the successes of Fascism in Europe, saving, for a time, at least, its civilization. It was a common belief shared even by FDR and others. However, mistaken, even Mises.
Then again, Hayek cited in
Road German philosophers prior to WWII who said similar to Mises that even if these ideas, Fascist ideas, didn't win victory militarily, they would in the battle of ideas. We do see ever a movement toward central planning of everything from the economy to personal lives.
A couple sources:
https://mises.org/wire/mises-fascism-again,
https://mises.org/library/mises-fasc...ther-questions.