Yeah, that didn't come out exactly right. It's a generalization that is unfair to many individuals but go into most gyms or review most people's programs and one will find that it is applicable to the overwhelming majority.
Over the years I've asked multiple pros about their training, I've lifted in the same gyms and seen their workouts, I worked right next to one for a period of 4 months right before he earned his pro card that year and went on to have a successful career. I can honestly say that were it not for the drugs he'd be just another decently build guy running around the gym. I'm not going to take anything away from his dedication to diet and his discipline in execution and knowing his body to come to a show in condition but his knowledge of training was insufficient to coach a good high school team or grow a lifter with more than a year's experience. His PT clients went no where besides a doc who got frustrated and got himself some roids.
So, is this small population that I have some personal experience with indicative of the whole - not really but we are also talking guys at the highest levels so obviously a decent level of training knowledge is not required to compete at the top and I can't ever remember being impressed by anything any pro BBer has ever said with regards to training (look at the machine dominated programs of the 1980s for instance - shitty stimulus but take enough drugs and you can still grow).
So yeah - it's unfair to a small number of BBers (and I'd say <1% and that's likely generous) and I definitely don't want to take anything away from them and their pursuit of knowledge but the overwhelming majority of that population up through the highest levels knows a lot more about anabolics and diet than they do about training.