He, the author, is saying that characterizing people as desiring struggle (as referenced in the book) is more psychologically sound than characterizing them as

He, the author, is saying that characterizing people as desiring struggle (as referenced in the book) is more psychologically sound than characterizing them as seeking pleasure as an end-goal as a hedonistic principle would state. It's not saying nazism is 'correct' and should be practiced, but rather the way nazis view human psychology is a better model than that of the hedonist.