As Harry is said to be not very insightful and not very clever about working out life, I've often wondered if the skin tone reference, about Archie, might have been him saying that Archie would be a cross between him and Meghan and someone saying: "You do know that genetics doesn't work like that, do you? You can inherit colouring and features from a forebear - not just your mum and dad. Like some of we cousins have Queen Victoria's colouring and nose, and others don't. Like Beatrice has Victoria's features and doesn't look much like her Mum - not even when she was younger."
And Harry's gone: " Really? It's not just your parents's colouring and height, you are a cross between?".
And they've gone - " Wake up mate. Didn't you do all that and recessive genes, in school Biology".
Then Hapless Harry tells Meghan, and she's gone: " What! They said that our child might look more like Doria.?"
And he's gone: "No. They just said that that it's not necessarily the case that although Archie will be the Queen's first biracial grandchild, he will look like a black grandchild"
And she has asked"Who said that?". And he said "I did. I said I thought that, as I'm fair, our baby will be a mix of you and me, but a bit fairer because I'm very white and don't tan".
I can see that correcting his knowledge of how genetic inheritance works could have prompted the whole discussion...which badly reported to her, because he can't take information in, probably, gets mis construed by her, because she is sensitive about what people say and egocentric and thinks every conversation revolves around her.