This exact line of thought has been used for decades to subvert the actual history of the Nazi party and their co-operation with corporations, undermining of labor unions, assault on socialist groups via their brown shirts, etc.
This is a fascist talking point. It doesn't matter where the user possibly derived it from.
The "National Socialist" party was explicitly anti-socialist. Their talking points explicitly refuted class boundaries, and enforced "cultural" boundaries, to create the scapegoat of the Jews as the primary cause for societal turmoil.
Do not take this user seriously. Do not allow yourself to get into the weeds, they will not take any real discussion seriously. They are acting in bad faith.