I would say the opposite. Non-divers just don't know the danger of diving. Before I got certifed, I have no idea about NDL, deco, embolism, nacrosys, O2 tox, how and why air consumption increase with depth ... The only thing I might have know is not to run out of air.
Assume the story as it is, it is very bad idea to teach scuba without instructor crudential. By crudential, I don't mean the card, but the knowledge to teach. And on top of that, bringing a first timer to a site with this kind of depth is another big mistake. A good instructor will probably not bring OW or even AOW student to this kind of site.