Not at all. IO Kit was raw, pure C++, with all the ABI consequences you must deal with (including fragile base class). Just go to see any header of any exported IOKit class to see what I am talking about.

There is no COM whatsoever, no IPC, no IDL, nothing, dunno where do you get that from.

I just find it funny to claim that C++ was even partially to blame for Be's demise, when Mac OS X since its first public release actually embraced C++ for a much more delicate component.