If you're referring to the sharp drop at the end of the graph, no. It's an artifact of the api change making it much harder to capture comments. We can verify t

If you're referring to the sharp drop at the end of the graph, no. It's an artifact of the api change making it much harder to capture comments. We can verify this by how the comments/day rank didn't budge, because it happened on literally every sub simultaneously. If you're referring to the gradual dip from its peak, I have no idea.