When I first thought about this, I was picturing it as a more intensive version of the coaching QBs get between series. Taking a deeper look, that comparison starts to break down. Sure, a small number of stills can show formations, stunts and blitzes similar to how QBs are shown coverages, but what about technique and opponent tendencies, which is likely the lion's share of the coaching. Without access to video, this type of coaching would require much more effort than what the QB receives in-game, and has to be coached to 3 plus players.
The amount of preparation, organization and effort to coach 3+ players in this way is no easy task, and likely something that most teams would struggle to pull off. They likely use a boatload of stills and have coaches focusing on each linemen with binoculars up in the booth. I'd be curious whether the coaches with binoculars are the ones coaching up the individual linemen in their off-series, or if they are breaking down the information to Googs, or some other means.
This is fascinating stuff, I hope the media asks a ton of good questions about it. Likely they'll ask dumb questions instead and roast BB for not giving good answers. It really is too bad. I have learned more about football watching BB pressers than any other individual source. It sucks that he is so rarely asked good questions.