There's nothing "system" about a compiler. What language hasn't been used to create a compiler or two? If languages used to create compilers are system language

There's nothing "system" about a compiler. What language hasn't been used to create a compiler or two? If languages used to create compilers are system languages, then all languages are system languages. Writing a OS is more "system", and certainly those using the Mirage operating system use OCaml as a system language.