I drank a ton of milk when I was a kid and I’m a whopping 5’ 5". I think they are using invalid statistics to analyse this. They’re saying milk will make you tall, and tall people have a higher risk of certain types of cancer.
Milk alone will not make you tall. Being tall doesn’t necessarily increase your risks of cancer. It could be something you do because you’re tall, such as eating more food. You can spin statistics anyway you want.