As much as you can argue he's a victim of the era of GT routes, he's really not a victim of his era. If anything the modern emphasis on aerodynamics over power and the aerodynamics of modern TT bikes and road bikes are why he thrives in the first place.
Remco can beat 99.9% of the population, @50% of all bike racers on a second hand beach bike with 26in balloon tires and a big basket on the front filled with groceries and beer!!
First mental, financial and physical pitfall made by amateurs is thinking that equipment is significant.
The motor and mind this little man possesses are super human. Guy needs to be told his lungs or legs didn't fall out on the road. The pain he can push through and his physical and mental gifts are extraordinary!
Sure the elite can exploit marginal gains, equipment being some for sure. And all the things you mentioned have made him better and faster..but even a loose claim that he is great because he occurred during aero era is incorrect. The guys at the top of the sport are special, despite the equipment not because of it.
I would say that the pain threshold of most top pros is a singular significant difference.. It's the thing that separates many with same or similar physical, physiological abilities, Remco and many others reject body signals that are literally saying, stop you are going to die, you are killing yourself. They learn that it's not true, that the sensation that your heart or legs are going to explode are just feelings you work with.
Many of your points are 100% valid, but even through science you can develop body and bike to go faster and further, but the mental baseline these guys have, work on developing is the true separation.