This blog post started with a tweet.
Truthfully though, it started a long time before the tweet.
If you've been anywhere near the Internet lately, you've likely seen some of this going around:
"Many product owners are just project managers who took on the role, and have no clue about what makes a product successful."
"AGILE PROJECT MANAGER?! I would never apply to be a job titled Agile Project Manager."
"He's not a scrum master. He's just a glorified project manager."
And, from my own mouth, years and much shame ago, "Who cares about mapping your BRD (Business Requirements Document) to user stories? The whole exercise is useless."