> It's entirely possible that EGS just doesn't work at really deep depths as you state here, but this seems like a qualitatively different argument to the one presented in the article.
A different argument to the one presented in the article, you say. Huh.
I suppose I can't claim to know more about geothermal than the author of that blog post, but if you check again, you'll find it does mention EGS. Apparently something made the author decide the problems with Quaise using that are non-obvious enough to need explanation.
The article you linked is about conventional geothermal wells, which drill into reservoirs of hot water; they just have hotter water than has been typical. Extracting hot water is not limited by thermal conductivity of rock, but what Quaise plans to do is.
Enhanced geothermal involves fracking. Typical proposals involve creating crack paths between 2 nearby wells by fracking from both. It's been tested some but so far has not been economical.
Apart from the cost issues of enhanced geothermal so far, Quaise plans to drill deeper to higher temperatures to reduce power block costs. Sufficiently hot rock flows a little bit which makes fracking ineffective. Fracking also doesn't work as well with supercritical water. (If not drilling to rock hot enough to flow a little bit under high pressures, it would be much better to use conventional drilling techniques.)