You're missing the point about how the industry is going to go through a great narrowing. In the past, you'd have one PM and 8-12 engineers. Now you only need 2-3 people with both product and engineering ("architecture", to quote the author) skillsets. You are absolutely correct that most engineers are not interested in the Product side - those are the engineers who are going to get cut in this great narrowing. Quoting the author:

> I grew up with the distinction of "tech guy" needs a "product guy". I am not dismissing it, I am just saying that the world is entering into a phase where both roles are eventually melting into a single function.

The whole reason why Engineering exists in organizations is to take Product's ideas and turn them into reality. When Product can realize its own ideas (through AI) then Engineering is no longer necessary as a political sub-organization. Making it happen requires engineers to learn Product skills and adopt a "Product" job title. We will likely call people with both skillsets Product Engineers. People who can't adapt to learning both skillsets are at risk of losing their jobs.