Trivium and Quadrivium aren't really liberal arts, at least not any more. Trivium was logic, grammar and rhetoric - the basics for understanding and making arguments; quadrivium was music, astronomy, geometry and arithmetic - the "proper" subjects that one might want to argue about.
I'd be inclined to count astronomy, geometry and arithmetic as STEM subjects, rather than liberal arts. But I don't think trivium and quadrivium have been a thing since the Middle Ages, and I'm sure that's not what the author was referring to.
I'd be inclined to count astronomy, geometry and arithmetic as STEM subjects, rather than liberal arts. But I don't think trivium and quadrivium have been a thing since the Middle Ages, and I'm sure that's not what the author was referring to.