That's why the intro screens for different versions of games like (say) Marvel Ultimate Alliance are different from platform to platform. So I think I can say with absolute certainty that Activision/Raven Software don't do it that way.
Based on intro screens, you can say with absolute certainty that a game was developed a certain way? I think most people here will need a little more evidence than that to make such bold conclusions.
I understand that some game developers write first, port later, but even in this case it's a huge advantage to use C++, as opposed to something like Blitz3D.