If it's not a custodial 529 account (i.e., someone other than the student/beneficiary owns the account), then in my opinion any money distributed from the 529 should not be considered as support that the student provides for himself/herself. The name on the 1099-Q and tax liability is a red herring. If the distributions were made payable to the account owner, who then gave the money to the student/beneficiary or paid the expenses, the account owner's name would be on the 1099-Q and face any potential tax liability. For me, it's about with whom the control resides as to when, for what and to whom the distributions are made. If the student/beneficiary doesn't have control over any of those three factors, I think it's awful hard to say that this is the student providing support for himself/herself.
Edited to add: in case you haven't seen it yet, here's some light reading on the subject: