It's all correct, except maybe for the claim about it first becoming popular with Confederate veterans in 1904. Haven't heard that one before.
"As a people, we are fighting to maintain the Heaven-ordained supremacy of the white man over the inferior or colored race; a white flag would thus be emblematical of our cause."
You're also not "honoring your heritage" because the Confederacy was a three-year blip, not an era. Or a culture. Except insofar as being a collective of racist assholes is a culture.