I could be wrong, but I think the poster you were responding to was going for irony with that statement. Ragerschnapple was saying a 4th round pick has value, and used Benn and Klingberg as an example. GM just took that and went a step further, using a more extreme example.
Really, a 4th round pick doesn't have much in the way of value. It's loose change. You don't necessarily want to just throw it away, but it isn't valuable either. The question is, do you value it higher or lower than a chance at a 1st round pick. Personally, I'd value a 4th round pick lower, if you have even a 10% chance of getting the 1st round pick.
Gems can be found in any round, and often it comes down to just being lucky.