Your original source is is that DeuxMoi was unwilling to publish the story? The bar for them to not post something this juicy is pretty low so the fact that the source didn't clear it is telling.
It is clear just watching the show that the show runner and some writers didn't care about the source material. The characters are all weaker in the show on a moral level, they have less depth of personality and sometimes come off high-schoolish. I don't even think the original source material is THAT highbrow and still sometimes I feel like The Witcher gives CW show vibes.