I'm not calling anyone a liar, but I will admit that I am cynical.
My best friend is a personal trainer. 6'0" 187 pounds and just plain YOKED. He played baseball and basketball in college, his dad played for the Cubs, and his younger brother won the Decathlon at the KU Relays. Just a freak athletic family. I just text him and asked him what he would put up on combine bench. He replied 10-12. 12 would put his calculated 1RM at 325.
This is why I'm cynical.
For example, Creighton Duke's 13 is a calculated 1RM of 338. At 164.8 pounds, that is more than 2X his body weight.
If some of these numbers are truthful, I am VERY impressed, so take that as a compliment.