These are excellent points. Unfortunately, I'm a bit hampered by the fact that I stole the chart in question from the original study (pdf), and they used only "dynamite plots" in their paper. After reading your links on the topic, I can definitely see why this is bad. I'm appending a short note to this effect as an edit to my original article.
Thank you for bringing this stuff to my attention.
Today is Ada Lovelace Day, when STEM enthusiasts highlight the work of modern and historical women scientists, engineers, and mathematicians. If you run a blog, you may want to participate by posting about a woman in a STEM field whom you admire. But I'd love to have people share women scientists/mathematicians/authors in the comments that they think we could all stand to read more about.