I guess an alternate explanation is a 10x inflation in the advertising interface, but that would be defrauding the advertisers.
Usually a pretty reliable sign of botism. You see it on corporate driven posts on movie promotions a decent amount too. (Along with some pretty lame top voted comments)
It implies it's unusual traffic, but it does not imply it's inhuman traffic -- doubly so because the difference has already been explained in a way that doesn't require invoking bots.
Somewhat amusingly, after r/the_donald discovered it could push pro-Trump memes onto r/all by making every post on the subreddit about upvoting content, some other subreddits managed to pull off the same stunt in protest.
I'm not backtracking, you're the one who brought up that reflexively upvoting might be indistinguishable from botlike behavior. It's a feature (cultural value), not a bug.
It’s not the only subreddit with large bot populations, I’m just saying it’s one of the more toxic influential ones.