That poster also reminds me of the National Socialist labor recruitment posters targeted at "Slavic" people.
Polish-language poster, c. 1940-1941:
Let's go to Germany for agricultural work! Report immediately to your mayor.
Russian-language poster:
I live with a German family and feel just fine. Come to Germany to help with household chores.
In other words, Hitler's views on the "Slavic people" were more favorable than even Marxists, since Friedrich Engels doubted they could be integrated into the nations of "revolutionary peoples", and would instead have to be completely exterminated:
https://trueleft.createaforum.com/colonial-era/national-socialism-is-revolutionary-not-reactionary/msg11178/#msg11178https://trueleft.createaforum.com/colonial-era/national-socialism-is-revolutionary-not-reactionary/msg11179/#msg11179----
Wochenspruch der NSDAP was a propaganda poster/wall newspaper issued by the party from 1937-1944. The images below are particularly useful in demonstrating the importance of Socialism to National Socialists, since they're literally one-sentence propaganda posters printed for mass distribution. Long speeches and writings are one thing, but it is pretty difficult to argue National Socialists were anti-Socialist when their own, most basic, forms of propaganda called themselves Socialists.
https://en.wikipedia.org/wiki/Wochenspruch_der_NSDAPNote that the word Socialism is printed in a different color to emphasize it:
True socialism, however, is the doctrine of the strictest performance of duty.
-Wochenspruch der NSDAP ("Weekly Quotation of the National Socialist Party"), June 8-14, 1941.
“There is no socialism that does not apply to one’s own people. -Adolf Hitler.”
-Wochenspruch der NSDAP ("Weekly Quotation of the National Socialist Party"), August 27-September 2, 1939.