Do you think companies post a different, separate ad for every position?
They don't. Multiple people will apply for the job, and they will hire as many of those applicants as they deem necessary. You don't need to post multiple ads to hire multiple people.
When I saw the ads, I predicted that there would be some really dumb comments that were based on the assumption that there was only one job per ad. You can never go wrong underestimating the ability of people to think analytically.