You should read your own link again. It doesn't say that anywhere. Here's what it does say:
"Employers must attest to the Department of Labor that they will pay wages to the H-1B nonimmigrant workers that are at least equal to the actual wage paid by the employer to other workers with similar experience and qualifications for the job in question, or the prevailing wage for the occupation in the area of intended employment – whichever is greater."
Heck, another source from the US Department of Labor explicitly answers this question[1]:
"The H-1B employer is not required to recruit U.S. workers, unless it is H-1B-dependent, a previous willful violator of H-1B requirements, or an employer receiving funding described in the Employ American Workers Act (EAWA) which hires a new H-1B worker during the period Feb. 17, 2009 through Feb. 16, 2011. Such employers must take good faith steps to recruit U.S. workers for any job for which they seek H-1B workers."
1. https://www.dol.gov/sites/dolgov/files/WHD/legacy/files/whdf...