You're not participating in a good faith discussion. Yes, it is technically a line of credit but it's not the reason why you're being refused service. Overdraft risks for a personal account are small and can easily be accounted-for in the service fee or via insurance (which is the same in the end).
The reason for account closure is the fear of anti-AML laws and sanctions that have nothing to do with loans. Banks in fact love offering small loans and it's not uncommon to have your account closed while having a pre-approved loan at the same time — these are different bank divisions in action.
And in any case, turning personal debit accounts into credit accounts is not something that was asked for. I lived long enough to have used Visa Electron and Maestro cards that made most of overdraft scenarios impossible. It was the banking industry decision to get rid of them.
What exactly isn't true? That compliance is the reason why accounts get closed?
As far as I understood the article this is the main reason he gives. Loans or other objective reasons that can make the interaction with the client unprofitable are only drawn as (bad) analogies and not as the actual explanation.
To be charitable, I think tptacek was referring to a variant of "accounts aren't closed because of credit risk" as not being true. The credit risk talked about in the article was ACH reversals with a bankrupt account owner falling on the bank, rather than overdrafts.
