On the business of working the front brake against the throttle, there is nothing new under the sun. Gary Jaehne offered this same advice in his first book, Sportbiking: The Real World on page 62 & 63.
He suggested this as a way to deal with downhill, off camber turns, positing that using the front brake would keep the bike from gaining too much speed on a downhill grade, while applying throttle would transfer weight to the rear. His premise was even more nonsensical than that of the author linked in this thread, particularly since that isn't how he rode himself.
On a drive to Willow springs one year, he told me that he wore out rear brake pads two to one over fronts. I knew that for heavy braking he relied on the front brake, so I asked how that could be. He described trailing the rear brake on downhill corners as he rolled on the throttle, having the same rationale of limiting downhill acceleration via the brake while supposedly achieving rearward weight transfer by rolling on the gas. This was also nonsensical, but it at least left out the inherent danger in working the front tire against the rear.
I'm not sure why he changed his description of the technique by the time he wrote the book a years later. At the time of our conversation, he stated that most riders didn't have a fine level of control of their rear brake. He may have felt that riders generally have more nuanced control of the front brake. Whatever the reason, the description that made it to print was a lot more dangerous than what he had originally described.