No - AI is just as energy-efficient as your brain.

The conclusion seems rather to be "human metabolism is less efficient than solar panels," which, while perhaps true, has limited bearing on the question of whether or not the brain is thermodynamically efficient as a computer when compared to current or future AI. The latter is the question that recent discussion has been focused on, and to which the "No - " in the title makes it seem like you're responding.

Moreover, while a quick Google search turns up 100W as the average resting power output of a person, another search suggests the brain is only responsible for about 20% of energy consumption per time. Adding this to your analysis gives .13% "efficiency" in the sense that you're using it, so the brain still outperforms AI even on this admittedly rather odd sunlight-to-capability metric.

I made a similar point (but without specific numbers - great to have them!) in a comment https://www.lesswrong.com/posts/Lwy7XKsDEEkjskZ77/?commentId=nQYirfRzhpgdfF775 [LW · GW] on a post that posited human brain energy efficiency over AIs as a core anti-doom argument, and I also think that the energy efficiency comparisons are not particularly relevant either way:

Humanity is generating and consuming enormous amount of power - why is the power budget even relevant? And even if it was, energy for running brains ultimately comes from Sun - if you include the agriculture energy chain, and "grade" the energy efficiency of brains by the amount of solar energy it ultimately takes to power a brain, AI definitely has a potential to be more efficient. And even if a single human brain is fairly efficient, the human civilization is clearly not. With AI, you can quickly scale up the amount of compute you use, but scaling beyond a single brain is very inefficient.

If you go this way, you have to include the energy cost of growing a human on the one hand and building and deploying the solar cells and the chip factories on the other.

Can't you make human food production a lot more efficient with biotech? Algae, for instance? Spirulina maybe? Tastes bitter, grows fast, highly nutritious. (Are plants or algae as efficient at generating sugars from sunlight as new forms of life evolved to directly use electricity from a solar panel would be?)

Even if that wasn't practical for humans, if such an organism would be very easily imaginable I think that still gives us some weird biopunk menu options for the medium-term future of intelligence?