If you actually bothered to read properly what was written, it says Hitler rejected Socialism and Communism because it destroyed the natural unity of the people. ie, this is NATIONALISM.
Marxism doesn't destroy nationalism, far from it.
Marx Engels and Lenin on the national question Links International Journal of Socialist Renewal
Nations and history
In his introduction to the Penguin collection of Marx's writings,
The Revolutions of 1848, David Fernbach accuses Marx and Engels—Engels in particular—of a "general great-nation chauvinism" based, he claims, on "the major miscalculation that the smaller peoples of Europe were doomed by the logic of history, and had irrevocably lost their autonomy".
Is this the case? Marx and Engels supported the national struggles of the German, Italian, Polish and Hungarian peoples—the so-called "great historic nations"—because each had developed to the stage where their struggle for national unity and independence from the reactionary powers was politically viable and progressive. Their victory would hasten the demise of feudalism and speed the arrival of socialism.
Hitler and the socialist dream - Arts and Entertainment - The Independent
It is now clear beyond all reasonable doubt that Hitler and his associates believed they were socialists, and that others, including democratic socialists, thought so too. The title of National Socialism was not hypocritical. The evidence before 1945 was more private than public, which is perhaps significant in itself. In public Hitler was always anti-Marxist, and in an age in which the Soviet Union was the only socialist state on earth, and with anti-Bolshevism a large part of his popular appeal, he may have been understandably reluctant to speak openly of his sources.
His megalomania, in any case, would have prevented him from calling himself anyone's disciple. That led to an odd and paradoxical alliance between modern historians and the mind of a dead dictator. Many recent analysts have fastidiously refused to study the mind of Hitler; and they accept, as unquestioningly as many Nazis did in the 1930s, the slogan "Crusade against Marxism" as a summary of his views. An age in which fascism has become a term of abuse is unlikely to analyse it profoundly.
His private conversations, however, though they do not overturn his reputation as an anti-Communist, qualify it heavily. Hermann Rauschning, for example, a Danzig Nazi who knew Hitler before and after his accession to power in 1933, tells how in private Hitler acknowledged his profound debt to the Marxian tradition. "I have learned a great deal from Marxism" he once remarked, "as I do not hesitate to admit". He was proud of a knowledge of Marxist texts acquired in his student days before the First World War and later in a Bavarian prison, in 1924, after the failure of the Munich putsch. The trouble with Weimar Republic politicians, he told Otto Wagener at much the same time, was that "they had never even read Marx", implying that no one who had failed to read so important an author could even begin to understand the modern world; in consequence, he went on, they imagined that the October revolution in 1917 had been "a private Russian affair", whereas in fact it had changed the whole course of human history!
His differences with the communists, he explained, were less ideological than tactical. German communists he had known before he took power, he told Rauschning, thought politics meant talking and writing. They were mere pamphleteers, whereas "I have put into practice what these peddlers and pen pushers have timidly begun", adding revealingly that "the whole of National Socialism" was based on Marx.
