Is there any professor in a university in Germany or Austria who thinks that the nazis were lefties?

[Pick Up the Phone]

Probably Hans-Hermann Hoppe. But like most terrible thinkers (Mises) he found himself in the dumpster of ideas - the American libertarian movement.

Oh, I totally forgot about this guy, but technically he is not a "professor in a university in Germany". On the other hand, his argument would probably more like..."democracy, communism, national socialism, social democracy and American liberalism are all just tools to expand state activity, centralize political power, spend money and diminish freedrom"

Exactly, his distinction in this case would be statism/anti-statism rather than left/right.

I can also second what my fellow German contributors have written: Don't know anyone in academia who would call national socialism a left-wing movement or the NSDAP a left-wing party. However, there is a (limited) academic debate whether national socialism should be classified as fascist or rather as an ideology sui generis that was merely inspired by fascism.

[Pick Up the Phone]

Which is the meaningless "distinction" cooked up by crackpot "libertarians".

Well, meaning lies in the eye of the beholder. Not that I agree with it but I cannot say that it is meaningless from a libertarian perspective.

And no need to put distinction in quotation marks. Because a distinction it definitely is.