Oh man. I guarantee they were inspired by The Home Edit, who are the Instagram'd version of Marie Kondo with none of the depth. Lots of "organize by rainbow color", not a lot of practical advice.
Sounds like one hell of a story that, oddly, I would probably nod along with in solidarity and a general sense of “yep, mine was like that, too”. Came out of that relationship a much more grateful and humble person even if it didn’t work out between us, and every now and then I look over at my bookshelf and smile.
(It wasn't me who did it, but I left it that way when they did it.)