The author is probably talking about video editing of some kind, whereby he either regrets not saving more source code or taking more screenshots of his work if I had to wager a guess. Not sure what the "non-realtime/static artifact from code" refers to when it comes to video editing -- perhaps much of it was rendered from code? 3D software, programmatic editing, etc.?
Wabi-sabi being used a bit weirdly in this context, but I think they mean the temporality of it all has innate beauty. Sometimes not capturing every single moment/line of code is OK, and there is beauty in a moment not strictly captured, to be appreciated more since you'll never see it again.