I got a call from "Bank of America," and they smoothly talked me into giving them my debit card PIN. The trick was they had gotten into my online banking beforehand. "We've detected possibly fraudulent activity on your account." Then they read me real transactions from my actual account. "To be safe, let's lock down the account. For this we need more information for authentication, though." Probably started from a phishing thing that I fell for online without noticing. It was pretty clever of them. Not so easy to steal from a checking account without leaving a trail, unless you have the PIN. Then the main risk is to whomever was on camera at the ATM withdrawing as much cash as possible before the account was automatically locked down.
The next day, I got a call from "Bank of America" telling me that I'd been had. Fortunately they just credited the money back into my account. About $5000.
The main difference is that the first call wanted me to give them information, while the second call advised only "go into a bank branch in person."
The article's advice is correct. If someone asks you for info, tell them you'll call them back. It is almost certainly a scam. Calling back the possibly spoofed number at worst wastes a little time being on hold, and at best saves you or the bank a lot of money.