That’s incorrect, the scholarship must be deducted from total support, whether it’s taxable or not:
“ Scholarships.
A scholarship received by a child who is a student isn’t taken into account in determining whether the child provided more than half of their own support.”
What you need to add up for parental support includes any spending money provided, plus the value of imputed rent for any time they spent at home (based on a pro rata share of mortgage, insurance, food etc), plus the value of any other incidentals (of which health insurance may be the largest) and compare it to their income. That’s why I said even with a full ride they may need to earn $5000+, and more if they live at home during the summer and don’t pay rent.