In all honesty, I can't think of what he's referring to except the plundering of European (including American) merchant ships and the kidnapping of their crews by the Barbara Pirates. In 1800, 20% of US government expenditures was in tribute payments to these states. In 1801 and 1815, the United States went to war with the pirates to end the tribute payments.
He means the revisionist claim that African slaves imported to the US were Muslims. Given that over 90% of slaves imported into the New World were to the Caribbean and South America, it would be expected that Islamic influence would be much greater there.
The ‘narrative’ counts, not facts.