Again, if you have evidence to the contrary, you can contact the author of the research paper, or you can submit your findings to a peer-reviewed academic journal. Here are some further academic sources that also support the claim that the Nazi economy was heavily engaged in privatization, and some relevant quotes:

“After the 1931 banking crisis the survival of the four German great banks was safeguarded only by a huge injection of taxpayers’ money. In return, the great banks were partly nationalized and the two worst affected, the Dresdner Bank and the Danat Bank, were merged. Re-privatization was, however, started only a few years later and finalized under Nazi rule in 1937.”

Source: After the Crisis: Nationalisation and re-privatization of the German great banks 1931–1937

“There occurred hardly any nationalizations of private firms during the Third Reich. In addition, there were few enterprises newly created as state-run firms.”

“The foregoing discussion is clearly corroborated by an analysis of Nazi intentions. Available sources make perfectly clear that the Nazi regime did not want at all a German economy with public ownership of many or all enterprises. Therefore it generally had no intention whatsoever of nationalizing private firms or creating state firms. On the contrary the re-privatization of enterprises was furthered wherever possible.”

Source: The Role of Private Property in the Nazi Economy: The Case of Industry