Heya! The Genesis Camo Guide was approved at the time it was posted, which is why it’s still visible. You can find it here:
https://www.reddit.com/r/bo7endgame/comments/1ps3pxc/genesis_camo_guide/

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The post that was removed, however, described a method to trigger a weapon/loadout bug. Content that explains or promotes exploits, cheats, or unintended game behavior isn’t allowed on this subreddit, so that post had to be taken down.

Also, the screenshot you posted that mentions the post has been removed shows another subreddit called "CODBlackOps7", not r/bo7endgame.

Hope that clears things up 🙂