"Bodybuilders" is a broad term - the top bodybuilders are definitively up to date on the science. Maybe they train with long breaks (but tell their clients (and the fitness rags) that short breaks are ok so normal people can finish the workout in a timely fashion and keep up a routine) or have a complex training (to stimulate growth from an already high level) with variables the studies didn't capture.

On the other hand an authority on bodybuilding better be shredded.