It shows that Nazism was anti-market and had political affinities with communism. It makes a good case that there was no affinity between Nazism and big business.
I believe there is little difference between National socialism (Nazism) and International Socialism (communism). The former sought an empire with Berlin as its capital city. The latter sought an empire with Moscow as its capital city. A political continuum that stretches from national socialism to international socialism is a very short continuum. It omits the American political experiment and much of British history.
My only objection to the article may be its title! Even siblings have rivalries and these can be great, even leading to war.
The left is not logical and it can be futile to impute logic to people and movements that are driven by emotion (for example resentment of the rich) rather than by reason. Some American liberals have described communism as liberalism in a hurry. Perhaps this provides a logical basis form making distinctions: Liberals want it soon; Nazis want it very soon; Commies want it now.
Rush once said that the only difference between socialists and communists is that a socialist will let you live if you disagree with them.