Was Beecher ever actually a nazi in the show? It's been ages since I've watched it, but memory says he was only briefly involved with Simmons' character in that regard, never actually a member of their gang.

Which is beside the point, but it took me a minute to parse the sentence; it looked like this new show had Beecher as the father of the main character rather than the actor playing the character's father, so it made me wonder.

Which, thank you for providing context :)!

That means that the post is inaccurate, which is fine, but people be trippin sometimes lol.

That's definitely plausible, though I don't think it's the most likely scenario. Intentionally choosing that extremely hateful Nazi code without any other context or understanding would only serve to grab the attention of Nazis or people who know that it's a code used by Nazis. Using this thread as anecdotal evidence, it's not mainstream and many people don't know it exists/think that is a big deal. I don't see CBS advertising their new show which otherwise makes zero reference to white supremacy or Nazis by using a Nazi code.

I find the most likely reasoning to be that it way placed there intentionally but with plausible deniability to the graphic artist. "I just used a picture of an elevation map because he goes and finds people in the wilderness!"