You might miss this now as it's late, but the screen shot of your traffic results doesn't include the page '/macro-recorder' in the section titled 'It's not that simple'. That's the page you were talking about in the paragraphs above in the article, that's the page that's still number 1 in google when I search and still has your screenshot next to it when I search for 'macro recorder'.
It's the crux of your argument and it's completely missing, it's the only relevant page, everything else is almost completely irrelevant.
I'm not at all disbelieving you, but I'm also honestly saying you don't really seem to understand the scientific method if you think what you published is good enough to support what you've claimed. It's a half finished investigation, the facts are completely inconclusive.
And that's what undermines a lot of SEO experts opinion still today. Speculation without fact. Your post at the moment is plausible but without the most important serious fact. What traffic were you getting before the picture appeared for that one page, and what traffic were you getting after the picture was added. Can you confirm that you didn't change the meta description or title at all?
Everything else is a distraction to the most basic scientific method and that is what makes the article bad, you've conflated a bunch of different 'symptoms' with one hypothesis.
(post author here) I did post the screenshot of the results page, it includes my page, not hiding anything