Earlier quoted context omitted.
Something doesn't add up in the story here. It seems like they suggested every other way in the book to withdraw funds other than a regular ACH transfer.
It seems like the guy doesn't want to have a bank account anymore. If he just is moving to a different bank, then all he has to do is make a ACH transfer. Also, the Bank may have a reporting requirement for over 10k withdrawals in cash but they will let you take even more than that in cash if you want to. You may have to work it out with them to get enough money on site at the branch if you have hundreds of thousands…
At the time, he may have had issue with walking into a "branch" of Simple. While BBVA was the parent bank for Simple, their branches had zero insight into Simple bank accounts. When the transition happened, BBVA branches were getting hit hard by Simple customers expecting sudden service. However as far as the BBVA branches were concerned officially those customers weren't theirs -- no BBVA account number, just Simple, which they never had insight to when it did exist.