It has nothing to do with student debt. I have a substantial amount of student debt (six figures) and I make enough to service it, own a home, and save for retirement. It has everything to do with (a) martial laws that allow a woman to financially rape a man and run of with his kids, (b) young women being told to seek a career and travel and live free (Eat, Love, Pray) and (c) to a large extent, more effective brith control that pollutes a women’s womb.
Student debt ... that is the author’s position on the impact on the number of live births. There is student debt and then there is student debt for worthless (intellectually or marketability) but that is another topic.
You raise three other plausible contributors. Until I saw parts of the movie Eat, Love, Pray ... I wouldn’t appreciated that one as much. No fault divorce ... and birth control - sure those are factors too.