Yeah, exactly. He writes "What deters them from studying this exciting, high-wage profession? Why do they go into math, physics, or engineering in higher number

Yeah, exactly. He writes "What deters them from studying this exciting, high-wage profession? Why do they go into math, physics, or engineering in higher numbers instead?", but students absolutely do not go into math or physics in higher numbers. I'm not very surprised by that: not very many people are smart enough to do math or physics, while computer science is much easier. Meanwhile, the fields that are larger than CS are the engineering and biomedical ones. I feel this is a bit vulnerable to how you slice it though, e.g. the number of CS graduates are presumably more numerous than any particular type of engineering (mechanical engineering etc). It's a bit of an accident that all those fields are grouped together and computer science is not. (This could have been otherwise, e.g. in Sweden you can study both of an MEng in "software engineering" or a BA in computer science, and the content is quite similar.)