I would have ignored any book with that blurb. Sounds too much like a used car sales pitch.
I can easily blow through 2000 words in an hour. No big secret to it. I merely write the scenes mentally throughout the day, and then I just have to type it up when I get to the computer. I get a lot of "writing" done while exercising, driving, waiting on line, etc.
What does that book suggest that is so special?