So the guy is saying that a black woman is a more modern messenger. That is just silly and shows he is politicizing the story to present day politics. What other parts of the story did they mess with? Telling the story is not their primary goal.
I just finished the book. Chani (daughter of Liet Kynes) was on the trip with the men when Paul met her. She had apparently proven herself and rode sand worms and all that. She killed some men in duels later who had come to challenge Paul. They made a point later in the book that a bunch of Imperial Troops attacked the home where Paul's son was killed and his sister was captured. Only a handful of the troops managed to escape. That was when the fighting age men were gone so it was all old men, women, and children fighting.
My only criticism of the book reading it again is it seemed the ending was hurried. He skipped over a whole bunch of stuff involving Paul training the Fremen, helping them develop rockets and artillery, helping them develop better tactics for attacking the Harkonens. He then skipped over a lot of the final fighting. Not a lot of mention of the Fremen gathering for the final battle, they were just there. Was that needed? I don't know. Just thought a couple more chapters covering that stuff would have been nice.