The furore about the picture is mainly about Serena's depiction AFAIK.
I have seen a couple of people trying to say that Osaka looking white and chill contrasted with the angry black stereotype is meant to signify Black=bad, white=good, but I think they're guilty of seeing what they want to see and making it mean something that was never intended.
As said, people see whatever fits their narrative. The pic isn't that deep...
How exactly do you depict a Japanese/Haitian in a figure that tiny and lacking detail? Remember, this was intended to go in the corner of a page in a newspaper, not blown up for scrutiny on the internet.
Mentioning that she's the first player of her particular heritage to win a grand slam is irrelevant because the pic isn't about her.
As said many times already, it's about Serena's behaviour effectively relegating Osaka and her achievement to the background. The cartoon achieves that.
Getting caught up in over-analysing her hair not being frizzy enough, her skin not being dark enough or her frame not being thick enough is simply looking for sleights where there are none and missing the point of the cartoon that was never meant to be an accurate depiction due to the nature of the art style.