They clearly show the flag on the surface of the moon. They don’t show him planting it, but they don’t show a lot of details that they could have shown throughout his career, so I didn’t see it as a slight, since the American flag is clearly shown planted on the moon while he and Aldrin are bounding around.
Imagine for a moment they made a movie about the Battle of Iwo Jima without showing the raising of the Flag on Mount Suribachi and the members of the movie company says says something about they left it out as they don’t see it as an American victory, but a victory for all freedom loving people? You feel the same?
The planting of the flag was an iconic moment that was deliberately left out so as not to offend the left here and abroad. It’s not “total BS” to complain about that. You can say it’s an overblown complaint, but it’s not nothing.