OK, OK. Too late for me to edit my comment, though. And someone on the internet reported that their Core-i5 Mac mini with discrete graphics gets hot whereas my Core-i5 Mac mini without it never gets more than slightly warm. (The Core i5 in the mini with discrete graphics is .2 GHz faster than the one in the mini without discrete graphics, but that is unlikely to make much of a difference.)
Your correction does not invalidate FilterJoe's article since he is addressing people who want to spend less than $700 for a quiet computer, and surely you will agree that adding a GT430 or HD6670 will invalidate his basic strategy to achieve that goal and the quietness goal, namely, to buy a laptop. We know that integrated graphics engines tend to be unusable for playing modern games.