You all might need to go here
http://en.wikipedia.org/wiki/Kenenisa_Bekele
and look at the right column.
That's 38 championship medals (including team medals), the majority of which are gold. KB is the GOAT when it comes to XC or distance track. It cannot be argued as he has won gold in and set the records.
Geb is still running fast, and there is no reason to believe that KB will not return to form once he gets some races under his belt.
That said, the quote is a bit silly. Like Toro said, you can't say Rupp (and the rest) beat KB, and KB can't say he is undefeated now.