I don't think people are dissing her for having a music degree. They are dissing her for apparently having no infosec experience (an accusation further intensified by her education also not being in a technical field). Whether that is true or not can be investigated. But saying that the row is about her having a music degree is a slight misrepresentation.
I was pretty sure it was true (that she had no experience at all) after listening to the first two or three minutes of the video interviews that were available here[1], but apparently they don't want anyone to see interviews with the CISO from before the breach. I have never seen anybody say cloud so many times in two minutes.
By the end of the interview, I felt sorry for her. I have no idea if she had relevant experience or not, she just sounded like someone who has been conditioned to argue that delays in new development are unacceptable, and that the cloud is inevitable, and if it costs more to do it right then you'll have to make do with less, and cetera and so forth.
I'm not terribly shocked that they've taken down these interviews, but I am very sorry I didn't save a copy when I found them. They were still available for viewing as of 12:31pm Eastern Time on Sept 10, and there are transcripts that you can find following the links in the article, which has been updated to note the videos were scrubbed from the internet.
Serious question, is there any way this might actually count as destroying evidence?