When I asked some of our older head admins about glitching, like Scott and Wolf, they said that those spots are glitching. Along with others not included here.
They described gltiching as any spot that isn’t accessible to any new player of the map(for example, if someone has never played ambush they obviously wouldn’t know of the glitch on those buildings, they wouldn’t think to look there or know how to access it themselves.) Any spot that makes a player harder to kill and/or gives them any form of advantage. AKA if there isn’t a door ladder or stairs to get there it is a glitch. (You know what I mean) I’ve always held my opinion of glitching to this.
I don’t know how Kevin or Dusty’s opinions relate to this but I was told when I returned that no rules have changed. So I try my best to keep players from using those spots.