@zapfino, those are all closely related majors assuming that the student in question has taken significant undergraduate work in the other field. A biology major, for example, would not be accepted to a physical anthropology program without some coursework in anthropology. A math major would still have to take prerequisite work in economics to get into an econ program. And a linguistics major would have to take significant coursework to make the switch into psychology.
It’s true that you can major in whatever you want in college and later get a graduate degree in another field. The essential missing piece of information is that you are going to have to take significant prerequisite coursework, often the equivalent of a major, in order to do that graduate program. In that sense, you “can’t” get a bachelor’s degree in art or fashion and then expect to enter an MA program in economics or accounting directly out of undergrad without significant coursework in those fields. Even the post OP posted says that, although the blogger underestimates the number of courses that you will have to take (I have a graduate degree in psychology, and an applicant would have to take at least5-7 courses in psychology to be competitive*).