Author here, I drew on this from AI 2027. Yes, a very-expensive AGI, e.g. $1 million / day to simulate a smart human, would be a huge deal. But it would have meaningfully different effects than a cheap one.

Here's one definition AI 2027 used [1]: "Superhuman coder (SC): An AI system for which the company could run with 5% of their compute budget 30x as many agents as they have human research engineers..."

[1] https://ai-2027.com/research/timelines-forecast

I've got no problem with your concept, and even think it's useful. I just don't think that concept and AGI are the same thing. Economically useful has no relation to what has been called AGI before.