Perhaps some young people report more accurately what they've got to do to their parents than others?
DS certainly did a couple of assignments (and an open book exam) earlier on this term (but he didn't tell us exactly how many!), plus his dissertation. He's now putting the finishing touches to a 'reflective piece' (2000 words) on his acquired dissertation research skills , and has another couple of assignments to do before his course finishes in six weeks or so. That seems like quite a lot of 'counting towards finals' work for one term. Whether it is more or less than peers doing different subjects at the same/different universities isn't something I'd have any way of knowing really.
And I don't know if this is true but I can imagine that very diligent young people are possibly more likely to consider they have a greater workload than those who generally don't sweat the big stuff?