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It's because 'unemployed' doesn't mean 'not working', despite what you'd think.

It's a specific subcategory of people who are in the labor market (trying to find employment) and not succeeding.

Higher wages can and do persuade some of them to enter the market, for instance a mom might need a few hours of childcare a week in order to work full shifts, and if the weekly salary raises enough that this pencils out, she'll start applying.

Just because a job is advertised doesn't mean the company is looking for that position to be filled.

Companies aren’t necessarily advertising these positions to everyone in the United States. You can make the open jobs number look as good as you want but really they’re specific positions that can only be filled by a certain individual.

People who have exited the workforce may rejoin it if the bait is good enough. Gas and used cars cost so much now I wouldn't be surprised if a lot of these jobs are money losing to the people doing them.