Firstly I will admit that the article was a bit much for me to process as a non-biologist, and that it didn't register that that was the entire point of the art

Firstly I will admit that the article was a bit much for me to process as a non-biologist, and that it didn't register that that was the entire point of the article until you said so :-) But to be a little defensive, yeah, I know shared environmental factors aren't really "heritable", I'm just saying that it honestly hadn't occurred to me before reading this article that they would be confused for heritable genetic factors, even though it does kind of seem obvious once it's pointed out.