Does Donald Knuth Know about This?

According to the latest research (with a sample size of 222, so we can't blame a minuscule sample size this time):

Study 1 found that information in hard-to-read fonts was better remembered than easier to read information in a controlled laboratory setting. Study 2 extended this finding to high school classrooms.

Does this mean Donald Knuth's work on making mathematics more readable was wasted?

On the other hand, this does explain Concrete Mathematics…

Wait a moment… What are the implications of this when combined with the research that found that (a few dozen) people under a cognitive load were more likely to endorse conservative opinions?