To be berthed is to be attached to your home, as a boat. It makes way more sense to keep the nautical analogy going than to switch it over to biology. This was likely a transcription error and/or pun.
We are born into a time and moored to it. Books are not. Books are distinct from people in this way. That's the point.
Since part of the interview is making fun of the way the questions are worded, it also fits in that respect.
Yes, someone "could" do it and we'd understand what they meant. But there's no reason to believe that's what happened here. Maybe "moored" did trigger an association with "birth"/"berth", but "birth" is not a mistake.
"Berthing" is also not a singular, one-time event, any ship has a multitude of berthings over time, in this context it makes no sense for there to be a "time that berthed it" as if it was some singular meaningful event, and it changes "time" into something that "berths" books...what would that mean in this metaphor that a time "berths" a book? Wouldn't other times also berth books in their ports? A time does not "berth" a book, it births a book.
Good day.
Tweet the author. I am very confident in this.
Anyways, I don’t have a twitter but you can feel free.