alt Hacker NewsCPython (the compiler) is the most popular implementation of Python (the language) like GCC, Clang, and MSVC (compilers) are implementations of C (the language). Other Python implementations include PyPy, Jython, and IronPython.
Nobody is "pretending" anything. These have all been around for 15+ years at this point. Your ignorance does not imply intent to deceive on others part.
saying the most popular hides the actual reason why it is popular though. it is the original python implementation. it defines the standard and functions a reference for all others. for better or for worse other implementations have to be bug-compatible with it, and that is what puts them not on equal footing.
for C compilers no reference implementation exists. the C standard was created out of multiple existing implementations.