I agree completely! I have a lot of scopes, but I’ve owned and used even more binoculars and the author’s claim is nonsense. The quality of coatings does have a great deal to do with how much light is transmitted to the eye, but, all things being equal and given the same number of lenses, prisms and equivalent quality coatings, more light will be transmitted by optics with larger objective lenses.
Light gathering or transmission is the last thing to care about. Repeatability is the most important aspect especially when dialing. Unfortunately this is something Reupold cannot do well.