In the SSA database, he is probably looking at name changes and calling them duplicates. Ninety-nine percent of these will be women changing their names after marriage. The same SSN transfers to the new name. He probably did not pull the column of data that has the original name in it.
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Musk, like Drumpf, is a vindictive, irrational, shoot-from-the-hip liar and bigot with a huge vendetta against USA's regulating and justice departments (just like Drumpf).