I think it's the oppositeAnd it's clear that the lore or in-game text itself is entirely Martin. Whereas they worked on the story. Interesting, but I can kinda see it.
the background lore, and the relationships between the demigods was all Martin
the main story as you play through it was Miyazaki and his team. He said in another interview he oversaw all of the lore this time which iirc he hasn't directly done since he wrote all the item descriptions in DS1 (because nobody else had time to do it)