All 21 million bitcoins are in that list.
Considering all 21 million bitcoins haven't yet been mined, you are wrong again here.
Finding them is hard. True. But NOT impossible.
It is also not impossible that every molecule in the arm of a marble statue vibrated in just the right direction at the right time and the marble statue would wave. When we get to such ridiculously small probabilities, no sane person considers them as a potential outcome.
"has anyone successfully found bitcoins through this method?" - definitely.
Prove it.
a one in who knows how many billions chance of landing the jackpot.
Given that there are 2^160 possible addresses, and according to
https://bitinfocharts.com/top-100-richest-bitcoin-addresses.html there are 130,000 addresses holding a balance of >$100,000, you would be talking odds of around 1 in 10^43, or 1 in ten million billion billion billion billion. For reference, there have only been around 430 million billion seconds since the birth of the universe, which is around 0.00000000000000000000004% of 10^43.
You and your stupid math aren't welcome here. What the fuck is wrong with you crushing on people's dreams? Are you some kind of masochist? You need to take those theories and shove them up your ass. Leave people to do what they want with the private keys. Your private key is in there too, I hope they hit it first.