I remember the story when it happened. With age comes knowledge! Saw them in Glasgow a long time ago and the stage backdrop was a confederate flag. The last time I saw them they had ditched it!
You probably know by now, but after the line "Well, I heard Mr. Young sing about her", you can hear either a sample or an impression of Neil singing "Southern Man". It's super faint, but it's there!
Think this is a good guess to be honest.
Would kind of spoil the surprise of their new show too and not sure they would gain much from doing it.
Coldplay did do both though - so maybe. You would think they would like some kind of warmup to be fair