alt Hacker NewsDeath of the Author.
One of the important elements here is the extent to which materially it matters. If I buy a book Lovecraft wrote a hundred years ago the money isn't going to end up diverted to support the "patriots" who want to intimidate my neighbours, whereas when I buy a Harry Potter box set for a relative you can bet that Rowling's share will help fund "Gender Critical" movements trying to make life worse for some of my friends and colleagues...
For books particularly I can totally buy Death of the Author, what I think I read might be entirely different from what the author says they intended, which further nobody can prove is what they actually intended. For that last for example I do not for one moment believe Vernor Vinge that he "Didn't know" what Rabbit is in "Rainbow's End". It's an AI. Maybe Vinge doesn't intend the book as a Singularitarian Catastrophe (you can argue the book thinks it's about avoiding such a catastrophe) but I don't see any way to interpret it where Rabbit isn't a super-human AI.
You're conflating whether one should feel guilty for supporting an author, and whether the author's speech outside a work matters to understand its intended meaning.
The latter is the actual Death of the author, the former is usually called Death of the author by people who want to separate themselves from the authors they know they can be judged for supporting.