It might be odd, but it isn’t close to proof. Arbeit macht frei was the extermination of millions of Jews. This s**t isn’t even close.
And millions of Jews and others in Europe also didn’t think Hitler would really enact the “Final Solution” and no doubt scorned and ridiculed people who were concerned.
“...isn’t even close...”
The issue is not the numbers killed but the ignored warnings. The Jews in Elie Wiesel’s village ignored Moshe the Beadle’s alarm based upon his own eye-witness testimony. The issue here is a similar shrugging off of critically important warnings.