Earlier quoted context omitted.
I see one paragraph that might fit that description. The one that starts with > However, the reality is that you need engineering more than they need you. And it's basically true. But I thought the line > You are overhead. Was too harsh and a slam. If the author really feels that's a notable point to make, it deserves a lot more explanation.
I have been a PM for most of my career. Lose engineering and you have no ongoing product, sales and you can not sell it, support and you can not service it. You get the picture. PM is not required for the basic operations of the business. Great PM is fundamental to success, but not to the day-to-day management of the business.
There are no "one PM shops".
Case closed.