did you hear that Cleopatra was black

Yes, and there are plenty of academic books written about it. The Egyptian lawsuit states though that “most of what Netflix platform displays do not conform to Islamic and societal values." So no, it isn't about the issue of Cleopatra being black at all but keeping her good enough for today's norm set by certain people in power there. Somehow some think that by her staying pure white (because of being of Macedonian descent) is somewhat reassuring. Oh right, all that marrying into the family will keep one white, etc. No, she wasn't white like Elizabeth Taylor because being Macedonian in the first place didn't mean that at all. And no blond hair and blue eyes for sure.

In short, no, it's not about "rewriting history". And there were plenty of white slaves in America too at one time. There were in fact at one moment of time more white slaves than black. Often they were people who wrote themselves away into slavery. Of course, the plantage slaves in the South were in general always black for obvious reasons that the white slaves near to never could do the work to be done there on the plantation. The same happened in The Caribbean or South America. And, of course, enslavement of Europeans was in general banned in the early 19th century, while enslavement of other groups was permitted. Even after several measures to ban slavery in the late 19th century, the practice itself around the world was continued largely unabated way into the early 20th century.

One example to illustrate why Egypte knows already that Cleopatra could be black and doesn't even care about it would be its former president Anwar Sadat. He was and is Egyptian.