I mean thats what its for. Maybe, like playing dead, he thought they'd get tired of fucking with him. Also, all of that seems like a hassle when you have the distress pin right there. And prior to this, no hint at the potential consequences. Also, you just want to go home at this point. Its been a little while since I read about it, but I think they said you can give us the pin or we will crack it with XYZ software (idk what its named). So there's a risk at that point if you think it might work. Idk, I'm not going to judge the dude.
Also they were saying that normal rules didn't apply at a border. No request for lawyer, no need for warrant.