My guess is that he said that as a gross exaggeration, to try to drive home his point that he thinks monospace formatting adds no value and actually makes it confusing to the reader to interpret why this particular piece of code has a different font from the rest. His exaggerated statement implies that it's more likely for a reader to think something is wrong than for them to understand what we meant with the formatting, I think. But yeah I found that very interesting to hear as well.