Ok, how about Ladybird: https://ladybird.org/posts/adopting-rust/

> I used Claude Code and Codex for the translation. This was human-directed, not autonomous code generation. I decided what to port, in what order, and what the Rust code should look like. It was hundreds of small prompts, steering the agents where things needed to go. After the initial translation, I ran multiple passes of adversarial review, asking different models to analyze the code for mistakes and bad patterns.

Sounds to me like "wrote their code using AI only".

And from the creator of Redis, antirez: https://antirez.com/news/158

> It is simply impossible not to see the reality of what is happening. Writing code is no longer needed for the most part.

I guess when you have 65k tests you can use an AI for transpiling, and it still seems it took an enormous amount of hand holding. That is very far from actually writing new code. But you tell me, are you a software developer? Write or have code written everyday? I am one and for me and everyone I know AI has been mostly just a (fantastic) replacement for google search.