If your most passionate followers include an unusually high number of Nazis, checking through their videos for Nazi references becomes a necessity. Or they could have known the whole time and thought it was a good dogwhistle to their buddies and an opportunity to trigger the libs. “It’s not from the Third Reich, you libs are always making up fake news about Nazi connections!”
We just don’t know whether it was incompetence or pro-Nazi signaling, which is a pretty solid indictment all on its own.