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Not the same issue. He was talking about split debit payments:

Old system: cashier goes first

With the old POS software, after the final total was calculated for your purchase, the cashier had the option of typing in a split-tender amount on the physical keypad located to the right of the screen.

After typing in the amount, he or she would press the physical "debit" button, also located on the right side of the terminal.

Then, the customer could swipe a debit card, select the amount of cash back desired, if any, and type in their PIN.

This procedure could be repeated up to 4 times total (3 times if loading a Bluebird card).
New system: customer goes first

Once your Walmart receives the updated POS software, the process is reversed.

Now, after the final total is calculated for the purchase, the customer can swipe a debit card, select a cash back amount, and enter their PIN.

After the PIN is entered, the customer-facing keypad will read "Waiting for Cashier," and only then can the cashier type in the amount to be charged to the swiped debit card and push the "debit" button, again using the physical key located on the right side of the screen.

In fact, the cashier can type in the amount of the split tender before the customer swipes a debit card – what triggered reader Serion's repeated error was the cashier pressing the "debit" button before he had swiped his debit card and entered his PIN.

This procedure can still be repeated at least 4 times (that's how many swipes I did this morning).