I think you misinterpreted the camping rule at all ...
Camping - (Wikipedia definition)
In video gaming, camping is a tactic where a player will obtain a static strategic position of advantage, often providing a clear field of view over a choke point or position of tactical interest whilst retaining cover for the camper. It differs from holding a strategic position by its requisite static nature and intensive cover.
This kind of camping - is part of the game - and not covered by admin rules.
What i've described as camping - is different although it does have same behavior nature.
Camping
SINGULARLY ... (forever alone camping so to say) in a game with full armor - is a violation of the game.
I've observed many players who use this tactic to gain high scores. Most of those players will leave the game on first kill or if there more than one player joined.