You misunderstand the purpose of an agreement like that.
It's not like it magically binds your tongue. It just makes it easier to sue you if you violate it. The fact that the student could win in a suit is irrelevant. He couldn't afford the time and money to fight.
Before he signed the NDA, they would have had a harder time suing him. Perhaps he could have spent merely $10k and gotten it quickly dismissed. After, the company could make it arbitrarily expensive for him to fight it. If he could have eventually proved coercion (which I'm honestly skeptical of) then he would have been off the hook -- after years of stress and massive lawyer bills.
It's not like it magically binds your tongue. It just makes it easier to sue you if you violate it. The fact that the student could win in a suit is irrelevant. He couldn't afford the time and money to fight.
Before he signed the NDA, they would have had a harder time suing him. Perhaps he could have spent merely $10k and gotten it quickly dismissed. After, the company could make it arbitrarily expensive for him to fight it. If he could have eventually proved coercion (which I'm honestly skeptical of) then he would have been off the hook -- after years of stress and massive lawyer bills.