I don't think that's insane, at least not in the game dev world. I was big into the Bethesda game modding scene 15-ish years ago, and did some work on e.g. Tamriel Rebuilt, and saw the scale and man-hours that went into that- and that was even using a premade modding toolkit, and I compare that to what I can build with Claude...

To be fair, in the game dev world there are a lot of things you can do now that would have been impossible, or required 10,000x the number of devs that it does now, e.g. making No Man's Sky without the proc-gen tools that can exist now would have been physically impossible. Point being, it's perfectly normal to be able to say, "using the tools available now, I can build what would have taken tens or hundreds of devs years of work in the past", in game dev.

The project I'm building rn is a black-box rebuild of a client that has been being developed for ~22 years, and I've rebuilt significant portions of it over the last 2 weeks. That was, quite literally, equivalent to tens or hundreds of peoples' labor.