Apparently the guy who started it edited his post to point to this analysis.
https://np.reddit.com/r/pics/comments/ia0ij/watching_fellows...
https://np.reddit.com/r/pics/comments/ia0ij/watching_fellows...
I could have sworn that Reddit prevented commenting and editing on post that are this old.
Until recently, you could reply to or vote on any post or comment less than 6 months old, regardless of the age of its parent. A recent change prevented voting or commenting on any thread where the OP is at least 6 months old, even if the comment you want to interact with is newer than that.