This is true but its assessment did match my personal experience as a developer who has built quite a few apps with React + Node.js + Postgres combo. The project I had written with my framework was only about 1400 lines of code (mostly declarative HTML) and my experience is that applications of that complexity would normally approach or exceed 10k lines if well written with React/Node/Postgres. So its assessment even seemed conservative based on my own estimate.

I once also worked on a simpler application (feature-wise) for someone else which was approaching 100k lines but it was poorly architected with a lot of bad abstractions and over-engineered. In this case I could claim that my framework is cutting almost 99% of the code but that's comparing to the worst possible situation. Still, even that's not necessarily an unfair comparison because, in practice, a lot of real projects do end up bloated to such extent after a decade or so, likely even more so now with AI. Any framework which can prevent that bloat code from being generated is genuinely delivering long term benefits.