The examples he picked were incorrect, but reuses happened several times already. The three major cases were the tent scenes (including the bjs, tekrok's teams and two bad ends), every dancer scene so far and of course most scenes in 0.8 on Rokgrid and Tekrok's path.
But to clarify, i support reuses and i still believe this game could handle a bit more of them.
Looking at it from another angle i think there are very few games on this forum that can match KoD. I'm no expert in any way and i don't claim to know them all, so correct me, but among the games with 2d art i know about only 3-4 competes with KoD on either the number of art or the art/monthly update category:
The Opala games and Roundscape both have large libraries, but they do so by commissioning lots of artists. And Third Crisis and a couple of other games don't draw backgrounds, just like NN did.
So unless i'm missing something, most developers which "outperform" Hreinn in the terms of volume, do so by game design decision. This game has a single artists which is both a power in the form of a coherent style and a drawback due to the limitations of Nomo being a single person with limited time and energy.