None of those quotes demonstrate anything other than the simple point that someone who has experience in riding a bicycle knows to get their weight back and low

None of those quotes demonstrate anything other than the simple point that someone who has experience in riding a bicycle knows to get their weight back and low so that (per your own quote) it is _nearly impossible_ even on steep hills to endo. It would be refreshing if you were able to demonstrate a capacity for admitting that perhaps you have something to learn. I would advise taking a mountain bike class and coupling it with something like the U.K.'s Bikeability or the U.S.A.'s League of American Bicyclists equivalent. I fear, instead, that you will spend your time hectoring internet strangers about the dangers of bicycle riding based on your own incapacities and incapabilities. Good luck.