Dilbert's very clear on its role personification. That's what makes the comic work.

It's how Dilbert is every engineer, PHB is every clueless boss, and Wally is every elder peer, Asok is every junior peer. That's what makes the comic relatable. It also, as the article points out, what provides constraints to these characters as well.

If it was mocking HR policy, then it would be signified with Catbert. It's not. It's very simple.