I’m not really sure who “they” refers to (parent, GP, the company, the employee?), but let me take a step back here and illustrate my point more clearly. Maybe it will help. What I’m trying to say is: this isn’t a court of law, it’s a collaborative conversation. Someone posits a hypothesis based on some estimates. Others are invited to build on either of those: the estimates themselves , or the hypothesis built upon it.

This is a healthier way of looking at online discourse than constantly asking people to provide sources and citations. If they didn’t mention them, you can safely assume it’s a guess. It’s implicit. Don’t like the guess, great: help us improve. We’re all in this together. It’s not a battle of “who has the best opinion”.

Maybe that’s what you were trying to do, in which case I’m sorry for misunderstanding. I genuinely didn’t understand your comment, please forgive me :)