This blog post is written by a product manager, not a programmer. Their CV speaks to an Economics background, a stint in market research, writing small scripting-type programs ("Cron+MySQL data warehouse") and then off to the product management races.

What it's trying to express is that the (T)PM job still should still be safe because they can just team-lead a dozen agents instead of software developers.

Take with a grain of salt when it comes to relevance for "coding", or the future role breakdown in tech organizations.