No, they were carrying on the analogy about artisanal home builders being replaced by mythical robots that do it perfectly.

In this analogy, we human software devs are the artisanal homebuilders and the fancy LLMs are the robots.

And yes, there's quite a cost to build all the datacenters for all the AI that Big Tech believes that people will want. But as you mention, the cost savings are enormous for even despite that, and will make a much larger set of problems accessible to real software solutions, that previously either stayed on paper, in peoples' heads, or maybe an Excel sheet somewhere.