Au contraire

For a blog post that talks about improving legibility by making a wise choice of fonts, this choice of non standard display of images -- requiring clicking or reading of footnotes ro figureout -- takes away from the seriousness of the message.

What was gained by hiding the second image under a click -- instead of simply placing images one after the other like any other blog post?

By your logic even the core message of the blog post itself could be rejected saying ..it helps if the readers knew how to read various fonts of text and stopped complaining about a non existent problem. Or why not just add a footnote under every button that sports fancy illegible text.