So if he meant 1200 SHEETS per hour rather that 1200 IMAGES per hour, then yes, the 8000 is faster than the 6000. The Cannon 7000 is 16 sheets per minute double sided on the 13.2 x 19 sheet.
Also, notice that he was very specific about 12x18 and NOT 13 x 19. Actually, the 8000 can't do the 13...