Nick Cave - correctly so - says that you can't write if you haven't experienced something to write about and you need to have an inner self that experiences things to do that in the first place.
But AI being trained on a vast amount of human writing, writing that was the consequence of the life experience of millions of selves, could be considered - if not a 'self' - as having experienced all the digested human experiences.
The mockery - the pastiche effect - is the result of asking ChatGPT to write something in the style of 'Nick Cave'. I bet it would read the same if you asked anyone to write something 'in the style of...'.
I don't honestly know.