Whoever provides a mirror would only need the cooperation of some user with 100 karma to circumvent that restriction. Unless you log which users viewed which deleted posts, and track which deleted posts have been published. Then the mirror might become a trading hub where you provide content from deleted posts in exchange for finding out content from other deleted posts. And at some point money might enter into it, incentivizing karma farms.
Whoever provides a mirror would only need the cooperation of some user with 100 karma to circumvent that restriction. Unless you log which users viewed which deleted posts, and track which deleted posts have been published. Then the mirror might become a trading hub where you provide content from deleted posts in exchange for finding out content from other deleted posts. And at some point money might enter into it, incentivizing karma farms.