His comment on the difference of the PC from "back in the day" is also odd, to say the least. In the DOS days, it'd take a fairly computer savvy user just to get a game to run, due to having to deal with memory allocation, for instance. I don't suppose they were less equipped to pirate games.
I think your getting the lines mixed up. He is saying 'back in the day' devs didnt have the problem of integrated graphics, which makes PC less favourable to develop for. Yes people did have to have some amount of savvy to get DOS games running, and piracy did exist, but it was far less of a concern. The internet and torrents really changed everything.
If roughly X amount of PCs have the CPU to power the game, you have to subtract Y amount who dont have the video power to run the game (due to integrated graphics) and Z who will just pirate it. X minus Y and Z = your potential market. Unfortunately Y and Z will probably get worse before they get better.