I don't think the author is necessarily advocating the throwing away of code here, they're advocating the value of being able to rapidly prototype and move on

I don't think the author is necessarily advocating the throwing away of code here, they're advocating the value of being able to rapidly prototype and move on from seemingly incomplete things. The whole value proposition of the digital world is that we can store and manipulate it for virtually nothing: there isn't the same cost to having digital stuff, and so there isn't the same gains from throwing it away IMO.