If all it took was a lie on an application for Robinhood to grant someone the ability to use extremely risky trading strategies, that's still Robinhood's fault. Robinhood isn't absolved of responsibility just because the student did something dishonest.
Given the fact he was 20 years old, his options application should have automatically been under a heightened degree of scrutiny, if not immediately rejected. That it wasn't indicates Robinhood is not responsibly implementing KYC controls, which is a huge deal.