You could make a game on a PC for a PC that no current PC can run at an acceptable frame rate.
They must have had to test the game code on the PC it was created on, therefore this is incorrect.
Computers that are available to the public or on a certain budget of say £1000 are a different matter. But these factors were not asked in the thread title
Maybe if the question was, can the average (define average?) home pc play games faster than a 360 or PS3 it would give different answers