Goodreads Librarians Group discussion
Requests for Superlibrarians
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Invalid books
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(That question was about a different author, but the links are about Books LLC, and the principle is the same anyway.)
From a sampling of three, the ISBNs also seem to be valid.
Anyway, you are probably aware that you requested the deletion of more than 20,000 books. Even if there was something to it, no librarian (or superlibrarian) could do that, only support may have such tools.