yes AIX is unix OS do it has any specific C or C++ library
like Microsoft has visual studio product. designed for AIX only (may be some optimization for their specific hardware.)
do IBM provide compiler and library for his OS which may or may not support some features of C++.
or he just make me fool. huh.... he might be working on some old version of AIX with some old C library and compiler on it.
IBM's flagship C++ compiler for AIX (XL C/C++) certainly supports templates, RTTI, and everything else (including much of C++11: they are committed to fully support both C++11 and C11 as soon as possible).
I use it every day.