It's intentionally misleading, they are technically saying they will meet the takeoff and landing requirements (which they are required to meet by law) but implying that the plane is going to be quiet at cruise (which they want to perform over the continental United States, not just over the ocean).

Moreover, their statement falsely suggests that Concorde does not "[meet] the same strict regulatory noise levels as the latest subsonic airplanes" but 36.301 says that Concorde also has to meet the same standards as subsonic planes (standards which exclude operation at cruise which didn't matter for Concorde because it was over the Atlantic).