It wrote the compiler in Rust. As far as I know, there aren't any Rust based C compilers with the same capabilities. If you can find one that can compile the Linux kernel or get 99% on the GCC torture test suite, I would be quite surprised. I couldn't in a search.
Maybe read the article before being so dismissive.
Why does language of the compiler matter? Its a solved problem and since other implementations are already available anyone can already transpile them to rust.
> As far as I know, there aren't any Rust based C compilers with the same capabilities.
If you trained on a neutral representation like an AST or IR, then the source language shouldn't matter. *
* I'm not familiar with how Anthropic builds their models, but training this way should nullify PL differences.