well it's a spot where the only way out is death. Tell me any other spot in any other map where you can't get out of without dying/suiciding and is not a glitch.
There is very limited view in getting killed and although it may be easy to kill someone there. In the video most of the team was guarding that glitch spot making it difficult to get to that already hard to reach spot.
And from the looks of the vid, you can still get kills there aiming up at anyone peeking over.
Seems like a glitch to me.