I’m glad I’m not the only one. That presentation of data is so offensive to me, it nearly threw me off from reading the article. There are a dozen ways to present that data better. The way the authors chose is so unreadable that it would even be significantly improved as a text table.
Otherwise I doesn't make sense to me. Maybe someone wrote by accident 2017 instead of 2027 and then swapped the legend so that it fits the graph's message.
Still, wondering why 6 co-authors, one editor and several peer-reviewers didn't notice it.