What I mean is more like they're not "C compilers", but "C/C++/Objective-C/Java/Rust/Perl/Bash/Fortran compilers".
huh? What compiler supports C and Perl and Bash? WTF?
Sure, most C compilers are also C++ compilers. I'm not sure why this would be surprising to anyone. I don't even know how you would create a C++ compiler that didn't also compile C.