One of my agility instructors used it on her most recent BC litter, I think. I'll ask her this week. I know she is doing a very similar program, if not that one, on the girl she kept out of that litter.
Long ago, I was told that anything you put into a dog's brain before 16 weeks of age is there for life -- for good or bad. I never understand why so many pet owners think dogs are 'too young' for training. The agility instructor with the BC puppy has done amazing stuff and the dog is just 14 weeks old now.
For anyone who is curious about this program: https://www.puppyculture.com/