That’s exactly what this is showing. The x axis is the fathers height and the y-axis the mothers height so you see daughters change of being taller going up when their dads are bigger. For sons the chance of being bigger than their father goes up with tall mothers.
You can hate on Joanne without being trans because she’s a terrible human being that put Jewish stereotypes in her books, made slave owning the normal and the people going against it the ridiculed minority.
She also made the jock main character that won sports because he always got the newest most expensive broom instead of hard work with rich parents a cop. Also she keeps retconning stupid stuff like how wizards just poop on the floor and magic the shit away.
On top of that she’s a TERF and just a giant shit stain on society that wizards should just magic away.
Imagine the only way to regret putting something made by a terrible human being on your body is to be directly affected by it. Imagine having empathy.