How? The way I see it it just makes things more extreme because you type orders of magnitude more in a ten minute comment than in ten minutes of coding.
But still, if this 95% of what you type is code, it takes much, much more time to type it than if it was a free-form text.
In other words, it means that 'if 99.9% of the time you spend typing isn't spent on typing code, you're doing it wrong'. Or at least I understood it this way.