Speaking of just other schools, that sounds like that would be without a tuition waver. Typically when these super low stipends are talked about, it is with full tuition paid for. Although I think I have heard that Stanford's PhDs don't get automatic tuition waiving and need to get grant money
"Tuition" is a bit nebulous for PhDs because most of your time is not actually spent doing coursework: my program had students take 4-5 classes the first year, and 2-3 more at some point in the next four years.
You were otherwise registered for placeholder courses like "Dissertation research" and expected to be full-time in the lab. There were plenty of educational opportunities (journal clubs, seminar series, the occasional workshop), but certainly nothing like a full undergrad course load.
You do have to pay tuition for those "thesis" and "dissertation" classes.
In the 1990s-early 2000s, when I was a gradual student at UT Austin, I worked for the university, but not as a TA or RA; as staff, I had to pay for my tuition. At the time, just the "dissertation" class was about $1000 per semester.
