It is the distribution that matters at a wage level cluster defined by DOL. There are four (i.e. entry, qualified, experienced, and fully competent) and those are higher than the medians.

See also Understanding H-1B Minimum Salary Requirements for Eligibility - https://day1cpt.org/news/understanding-h-1b-minimum-salary-r...

Both can be true. H-1B's earn less than their domestic peers, but far more than the domestic underclass they are brought in to keep down.