That was an interesting video -- and it led me to watch "Carbon Fiber -- The Truth" by an Australian guy interviewing a carbon expert who came out of Boeing and now does bike repair. He had a lot of interesting things to say.
He's pretty critical of the bike industry's carbon fiber manufacturing processes in general, but rides carbon bikes himself. He says carbon clinchers are a design intended for aluminum, and he only rides carbon tubulars.
One of his main points: Compared to aerospace, carbon fiber in cycling is sloppier in the layup with far less quality control and inspection, allowing defects like air bubbles and wrinkles to go to market.
Also, carbon fiber repair has to be done with knowledge of the layup stiffnesses, orientations and carbon grades and match the original design of the bike.
He uses a specialized ultrasound system to see if carbon is solid. He says visual inspection doesn't cut the mustard, and you don't see him tapping any quarters on a frame. As much as he strips away a lot of marketing stuff, his diagnosis of potentially risky carbon could be maybe where he does a little voodoo of his own. It would have been great to see him show how ultrasound detects a layup problem and then have him tear into it and fix it. I'd have loved to see, for example, how a carbon steerer that is at risk of failure presents differently from a sound steerer.
He says that the compression plug is absolutely a structural element and keeps a steerer supported against the clamping force of a stem. He calibrates his torque wrenches.