The rules of what "Similar", "Soundex" and "Fuzzy" do are no different for Authors between the new screen and the old Find duplicate books approach.
Similar does not "do nothing" - it will find you variations like "Arthur C Clark", "Arthur C. Clark" and "Clark, Arthur C." for instance. Fuzzy is the loosest search, it tries to flatten names out by taking the author last name and the first initial of their first name, in order to catch "A. Clark" and "Arthur Clark". However as you have found it will produce a lot of false positives from this approach.
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