It's mostly because these numbers are averages and the majority of wage growth is seen by those switching jobs. We're also talking about really small numbers here, wage growth isn't beating inflation by much, it about a single point difference, that's 10s of dollars per month difference. It also doesn't account for the massive inflation in previous years, so even if you got a good raise this year it likely brought you to the same level as pre-2020.
If you haven't changed jobs in over three years and have been getting sub 5% raises, you are well over 10% worse off than 3 years ago.