If you think Perl, Python, Ruby, PHP, Tcl and Lisp are all the same language, you've been sitting in another corner all your life, one possibly not as well illuminated as the C/C++/Java corner.
Well, I don't think he's being literal. He's saying (I think) that all of {C, C++, Java, Perl, Python, Ruby, PHP, Tcl, Lisp, Go, etc...} are of an ilk when considered against the wider realms of programming languages. In other words, they are each more similar to each other than any of them are to, say, Prolog.
