Is there a PCI Requirement for shuffling digits while accepting PIN?

The following image shows a PIN entry device which shuffles the digits.

. via twitter

I’ve seen this question, but it doesn’t cover why companies are still doing this.

I looked at the POS PIN Entry Device and the Software-based PIN Entry on COTSSecurityRequirements requirements and neither of them seems to have anything about shuffling the digits.

Is there a requirement or specification that I’m missing?