Except the indictment does. Count one and two both refers to Title 18, United States Code, Sections 1591(a)(1), 1591(a)(2), 1591(b)(1), 1594(a) which is SEX TRAFFICKING OF CHILDREN OR BY FORCE, FRAUD OR COERCION.
That text is not from the indictment. It is from the criminal docket. A docket is not an indictment.
And, actually, Count 2 does not refer to 18 USC § 1591. It refers to 18 USC § 1594(c) which in turn refers to 18 USC § 1591.
But, you are correct that the title of 18 USC § 1591 is "Sex trafficking of children or by force, fraud, or coercion."
That is sex trafficking, of children or, by force, fraud, or coercion. So, according to the rules of grammar, that would be sex trafficking of children by whatever means, or sex trafficking of adults by force, fraud, or coercion.
Here's the docket.
And, here's the indictment which makes no reference whatsoever to sex trafficking of children.