It is NOT nonsense. Read "Is it Fascist to be anti-Communist?".
Part of it is reproduced below:
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I. Philosophical concepts -
>>> Both Nazi-Fascism and Communism obey common ideologists : Marx and Hegel.
Evidences
* Nazi-Fascism:
1) "The National Socialist movement has one single master: Marxism." - Goebbels (Goebbels, Kampf um Berlin, page 19.)
2) "Mussolini likes to affirm that Marx is his spiritual father." (Mussolini y el Fascismo," in Que sais je. (in Spanish), page 31.)
* Communism:
1) "We are Communists, disciples of Marx and Engels."
(Thorez, M., Discurso del 28 de Octubre de 1937. Ed. Comite Popular de Propaganda.)
>>> Both Nazi-Fascism and Communism have an atheistic doctrine.
Evidences
* Nazi-Fascism:
1) "We want no other god than Germany" - Hitler
* Communism:
1) It is obvious Communism is atheistic.
>>> Both Nazi-Fascism and Communism have an evolutionist doctrine.
Evidences
* Nazi-Fascism:
1) "We know that there is no definitive state, that there is nothing durable, that there is only a perpetual revolution." - Rauschning (Rauschning, Hitler Said to Me, 1937.)
* Communism:
1) "There is nothing definitive, absolute, or sacred. The only thing that exists is the uninterrupted process of the future and the transitory." - Engels
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II. Concept of the State
>>> Both are heralds of a totalitarian state.
Evidences
* Nazi-Fascism:
1) "Everything in the State, nothing against the State, nothing outside the State."- Mussolini
2) "The State is the continent and the race is the content." - Hitler
* Communism:
1) "The dictatorship of the proletariat (the name given to the State) is domination unrestrained by the law and based upon force." - Lenin
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III. Economic Concept
>>> They promote socialism.
Evidences
* Nazi-Fascism:
1) "We are socialists and mortal enemies of the present capitalist economic system." (Der Nationalsozialismos, die Weltanschauung des 20. Jahrhunderts.)
* Communism:
1) "It is evident that Communism fights for the destruction of the capitalist system and the implantation of socialism."
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I found these from other sources -
"he [Hitler] repeatedly condemned Christianity for its opposition to the teaching of evolution . . ." *Daniel Gasman, Scientific Origins of Modern Socialism: Social Darwinism in Ernst Haeckel and the German Monist League (1971), p. 188.
Hitler said this: "He [Hitler] accepted evolution much as we today accept Einsteinian relativity."*Larry Azar, Twentieth Century in Crisis (1990), p. 180.