I have the feeling that RetiredCoder is the creator of the puzzles himself.
No, he’s not the creator of this puzzle. The creator removed puzzle #120 to make the total prize 1000 BTC. Retired Coder shared the private key for puzzle #120 after a year, and in the thread below, he clearly mentions he has 20 PC of the RTX 4090(maybe he's lying).
https://bitcointalk.org/index.php?topic=5512304.msg64643001#msg64643001If you look at the timing of puzzles #125 and #130, there’s just a two-month gap between them. So, do you still believe that in just two months, Retired Coder created a 1TB distinguished points table with 20 GPUs and also solved puzzle #130?