I'd imagine they didn't because it was more about the timeline and process of creating it? They did touch on briefly about why he wanted to create it.

We'd used Roboto as our main font, and we were running up against its limitations. It was originally built to work as both a display typeface for things like titles and text typeface for longer blocks of text like paragraphs. But it was difficult to read Roboto when it was small

Emphasis mine