It didn't though. Not good software at least. AI (which is what I'm guessing you're referring to here) is simply incapable of writing such mission -critical low-level code, especially for a niche and/or brand new ISA. It simply can't. It has nothing to plagiarize from, contrary to the billions of lines of JavaScript and python it has access to. This kind of work can most definitely be AI-assisted, but my estimate is that the time gained would be minimal. An LLM is able to write some functional arduino code, maybe even some semi-functional bare-metal esp32 code, but nothing deeper than that.