Well when I was reading it the other day I did think it was surprisingly bold of them to not only touch a slavery narrative with a ten foot pole, but to give that narrative a white savior trope ending (the evil wizard's apprentices helped the Hadozee overthrow him).
I suspect the lesson taken here is not going to be "employ cultural consultants", but rather that they should create a big list of subjects to never create new lore remotely touching. The cultural consultants will be for revising old lore.