Not being familiar with PHAT or Layne Norton (don't follow the BB'ing subculture that much) , did a search. Am familiar with the slang term.
Just looks like the old heavy-light training (one of the names of it), which a lot of power BB'ers and some power lifters (as mentioned by prizm) use for training. Some Olympic lifters on occasion also. Probably been in use since before the 1950's, at lease. So Layne Norton, or anyone else, doesn't have a patten on this style training. It does have a value for a lot of folks, but than again not every protocol works the same for everyone. Most athletes train this way or a version of it.
I understand guy's new to weight training, or with less experience in lifting, may have just discovered this training method...which can be a good thing. Worth a shot, though Norton's workouts may be a little too intense for some at first. So might ease into it, at first. This type training (basic heavy-light, form of wave training, etc) has been successfully for many men. Usually is cycled during a training year. Good Luck.