I’d want to pay off the loans too, but the guy who is investing the money is actually doing the right thing by investing the money. One of the summaries referred to the student’s loan as a Plus loan, so that student may be paying off the Plus loan for the parent, but will have fewer repayment options than others who can consolidate loans or go on repayment plans.
I did like that many of these former students realize they have to work 2-3 jobs to get rid of this debt. None of them said “Oh, and I have a $50k wedding to pay off too!”