That's like every language. The language you work in (typically) has all sorts of libraries that are lower level. And even if not it's not like you're code is 'running', it's compiling to lower level code that actually runs and the compilers that do that work are usually black box unless you're a compiler engineer.

The power of Python is that it's high level and very powerful and has a great community and ecosystem of tools/libraries. There's absolutely zero problem and totally a good thing if there are core libraries written in faster languages.