Nothing wrong with that. I ran it through straight Audiobook Mastering and this came out. No noise reduction.
https://forum.audacityteam.org/t/audiobook-mastering-version-4/45908/1
I have a production complaint. Being an instructor doesn’t mean you have to go slow. This is what it sounds like to me, and the clip doesn’t go beyond 20 seconds. A whole class of this would be deadly.
Koz