NFHS double libero wording issue?

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Theyve fixed the books

ART. 1 . . . Procedures for libero replacement and exchange:

A maximum of two liberos may be designated on the lineup for that set. Only one libero is allowed to be on the court during a rally. A libero is allowed to replace any player in a back-row position. A libero may serve in one position in the serve order. When two liberos are designated, either libero may serve in that position;

When a team designates two liberos, a libero is allowed to exchange with the other libero at any time the ball is out of play per Rule 10-4-2.

A regular player may be replaced by either libero. A libero may only be replaced by the player whom a libero replaced;