Just curious. Isn't that how development tools generally work? Would you be surprised if it was in and for a compiled language? (This isn't a dismissal. I'm curious about the aspect of this specific case that amuses you.)
Foundational tooling not being written in a compiled language (fast is good, it could be jitted, but ideally it's a single binary) is actually a huge tax that I'm quite glad we're getting over as an industry.
Python is probably the apex of the "slow + doesn't work without a magic environment" problem
I suppose it is how this kind of tool generally works. I think it's just some subset of the feeling I get when someone writes(implements?) $LANGUAGE in $LANGUAGE(e.g. brainf*ck in brainf*ck)