Well maybe you're right, because I just took a video of my computer waking from sleep and it takes 6 seconds. However, the time between when the backlight comes on and when the unlock dialog appears is a split second. I guess I was mentally attributing the remainder of the time to the hardware/BIOS.
Which brings us back around to the article. The five seconds of booting does not include the time between power-on and when GRUB hands off to Linux.