I know that seminar you are talking about and Pfaff’s quote. He’s discussing injuries using a tongue cheek phrase like “blew them up”. Of course a coach hopefully learns from their mistakes, especially one that has been coaching for 35 or so years.
Injuries are a part of the sport at that level. He also points out how he is less experimental with elites. His program has produced multiple medals in multiple events. Donovan Bailey was running what 10.36 or so when he first started training with Pfaff and Pfaff was not a sprint only coach by trade, he was known as a field event coach.
I guess you probably think Glen Mills and Stephen Francis and John Smith’s programs succeed only because of the great talent they get.