You said:

> Surely this would be indicated by a glut of unfilled job postings.

I posted a link about Ghost jobs. Then, you said:

>[...]it is a job posting an employer has no intention of filling to begin with.

GP' comment speaks to recent graduates feeling less engaged. Whether it's because they fail to meet the requirements, or the requirements are literally fake doesn't matter. AI isn't used simply to cheat on coursework, but also to erect a de facto glass ceiling viz fake jobs with fake requirements, engagement suffers.