I suspect that site is some kind of in-joke. E.g. read the regex-redux example in say c#, now look at the go version, now the python version…
It’s not really what you’d expect for a site called computer language benchmarks game. Each example just calls out to a very fast c library (pcre2) to perform the heavy lifting regardless of which language is being “benchmarked”.
"This module exports a set of functions implemented in C corresponding\n\
to the intrinsic operators of Python. For example, operator.add(x, y)\n\
is equivalent to the expression x+y."
Why wouldn't you expect that CPython regex would "ultimately" be written in C?
But everyone knows it is significantly faster than Python. Probably at least a few times for pure JS vs. pure Python programs. Not that it matters, Python is basically glue to run mostly C and C++ programs.
Because it's obviously not the idiomatic way to use Python. No one is going to bother writing a program that way in Python, they'd just write it in C or C++ then link it.
Python basically using C types and GMP to write C in Python...