You should look closer at my post and notice the "any other flag with it as a device". Hint: my point remains the same.
Your analogy is wrong, as the device is rendered in its entirety when embedded in other flags. Very related: have you heard of the Union Jack?
It wasn't one flag among many, though. The battle flag (and, consequently, any other flag with it as a device) was the Confederacy's main symbol from what I've read (your earlier Wikipedia link did not dispel this notion).
I still don't understand your disagreement with the author.
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Huh, according to the map I checked there'll be 96% coverage here. I guess we should try to get glasses after all... Oops.
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Unless I'm misreading, you just rephrased what the author said. The battle flag went from a military/national symbol to a racist one because racists use(d) it.