[knowaveragejoe]

He's referring to the problem of comments becoming out of sync with the code they're referring to. Not everyone updates comments as they update code.

[jdbernard]

And those people deserve a special place of torment all their own. How hard is it really to update, or at least delete comments that are no longer relevant when you modify the code?

[knowaveragejoe]

It's not that it's hard, it just may not be apparent that you need to do so.