Not ignoring anything, just commenting on what the graph says as a singular piece of evidence. And it's "the hundreds of other signals that tell a similar story" that can lead to confirmation bias (ie. following a narrative arc) and potentially interpreting this piece of evidence more strongly than it actually deserves.
See, you're part of the problem. This perfectly demonstrates the point of confirmation bias. You've already decided what the evidence shows, so you don't need to analyze it independently and objectively. "We already know what it means! Stop thinking!"