Actually that was "aural sensitivity" and had to do with detecting anomalies subspace transmissions. "Aurla" =/= "oral. And she used the past tense, implying she was no longer his student, and the website had her working as his TA in a Phonology course.

(Why Spock is teaching Advanced Phonology and Morphology is a bigger question, but it may have been the writers were going with Amanda Grayson's background as a linguist from the novels, and maybe he specialsied in it because of his mum?)