The term "Death of the Author" came from Roland Barthes. The term doesn't mean "I can ignore how the author behaves in real life, or what she says that is unrelated to the work, in my appreciation of the work". So, "Death of Author" or not, nobody needs to keep tabs on some author's inane blatherings on Twitter:
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"Death of the Author" means "I can ignore what the author says
about the work in my interpretation of it". My favorite example is how Tolkien claims LoTR is not an allegory because he is averse to allegories, yet I can't help seeing certain passage as anything but allegories -- and what Tolkien claims doesn't delegitimize my analysis of LoTR as a Christo-political allegory, if I choose to make such an analysis.