He is asking for reasoning when he doesn't provide any, so his use of it is just idiosyncratic and stubborn. It is a noisy language that is hard to read in bulk and takes up a lot of space. It was invented for what was basically a computer game for kids, so why does he insist on using it for presenting technical material? Using fonts beyond their originally designed purpose with no reason is asinine and actually fashion, despite him thinking otherwise.
Venturing outside the box is fine. But it's an idiosyncratic choice without much, if any, upside and is ultimately a distraction and hides behind some perceived rational decision to use it. The linked Stack Exchange covers this, and one should consider the appropriateness of the tool being used. I think he'd agree on the same for programming languages.
