She's a PhD that literally teaches the stuff, and you're the person who couldn't even be bothered to read the mini-bio, not to mention the references at the end.
If she starts all of her lectures with "I cannot believe I need to explain these things to you basics", she might not be very good at teaching though.
How would you know how she teaches? One of her problems as a scholar is having ignorant geniuses claim all kinds of nonsense about the medeival times that are patently false. Her tone is to some extent a reflection of having to deal with those people.