That one does sound like hyperbole, or maybe he just works slowly as a human? People are different.
Likewise, I think they're having wildly different results. Look at how differently humans drive vehicles, and realize they're doing the same with compute. Some people probably are working at light speed, and some people are actually slower like in the study.
I'm talking about the scale. This was a large app with 60+ screens, 400+ component ui kit, and very rich features.
And had to work on ios/android/web.
I'd consider myself a pretty fast programmer, and I grind 12 hours at a time, everyday until it's done.
But between all humans it's a rounding error compared to the output of an agent swarm.
For personal projects, I pick and choose how much to use AI. But for work, agents go brrrr.