I didn't discuss the article. I believe I scoped my comment to the "infographic" in the first line, and closed with "But I doubt this is what the graphic is suggesting either."
I also shared the same information as your 2nd (aside: sound doesn't require air, as bone conduction headphones or scuba diving demonstrate, does require "not vacuum") and 3rd paragraph, and made the same point as in your close.
So I agree with you, which is why I objected to the graphic.
Sigh.