He is possibly the Harpocration mentioned by Julius Capitolinus (Life of Verus, 2) as the Greek tutor of Lucius Verus (2nd century AD); some authorities place him much later, on the ground that he borrowed from Athenaeus.
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A series of articles in the margin of a Cambridge manuscript of the Lexicon forms the basis of the Lexicon rhetoricum Cantabrigiense by Peter Paul Dobree.
(Possibly, the origin of the quote is from the 2nd century lexicographer Harpocration. See Smith, 1854. The entry on Kythnos is under the spelling "Cythnus").