I don't know who told him a lot of that stuff but the poor guy didn't even know the purpose of the Plasticover which was to provide a reed that did not need to be wetted in order to play. This made it perfect for doublers and others where a sax might sit for whatever reason and the reed dry out and wrinkle. The great Pete Christlieb used Plasticovers when he was on the Tonight Show for that reason. I use them on my doubling horns for the same reason, plus the fact that they play great! The 'brightness' thing only comes into play when the reed is too hard for your application.
Chicken or egg though. Brilliant to repurpose reeds that would otherwise be scrapped for cosmetic reasons. A product that found a market, or a market that needed a product? Another interesting comment is that Rico sold all their old school mechanical cam following "Francke" machines to "another reed manufacturer in France" in 2017. I'm betting it wasn't Vandoren! These machines appear to have originally been bought used from Glotin in the first place, because Vandoren had bought the Francke machine company and were not about to sell machines to their competitors!
I was totally unaware of the connection between D'Addario and Vandoren too, which effectively ended a couple of years after Vandoren chose not to go in with their US distributor in a deal to buy Rico.
Anyway, one big takeaway is that everything is now made on CNC controlled equipment, which in theory is a lot more consistent and offers a lot more design flexibility, but its no surprise if the end result we experience is somewhat different to that made on mechanically controlled production equipment back in the day. It would be interesting to take accurate CMM or laser measurements of old and new "Orange box" or royals or whatever and see just how they vary old vs new.
All the information is cited, either through documents or personal interviews with the protagonists. It is a doctoral thesis after all.