Well yes, as you're slowly reading this entire case, with the prior knowledge that he is getting scammed, and having all the time in the world to find the mistake or red flag in his actions, sure enough you'll find it. How very smart and vigilant you are.
But as the article already explains, those are not the conditions in which a scam happens. You don't know you're being scammed. The person sounds helpful, exploiting your inner desire to be cooperative. There's a sense of urgency, which disrupts calm and clear thinking. It was a very sophisticated and well prepared scam, which increases trust and makes you glance over or "forgive" small oddities.
Ironically, the fact that some of you chose to criticize somebody showing vulnerability is very emotional behavior, not rational behavior. Perfect candidates to be scammed.
By the way, are Americans still logging into online banking with a username and password? That's it? Please tell me that's a joke.