I know. It's a point of constant confusion for everyone. But if you go into AMCAS, you will see that the application you are submitting is for the "2023 Application Cycle."
For them, the application year refers to when you will start school, not when you submit an application. They apparently think it's less confusing to not make a distinction, and keep everything the same, keyed to when classes begin, not to when you submit. Which actually makes sense, because some schools have final deadlines after 12/31!
This causes confusion every year when AAMC reports admissions statistics in October, because they always label it as the current year, and people always wonder how they can have stats in the beginning of a cycle, without realizing that the stats they will report in October for the "2022-23 academic year" will be for the people who applied in 2021 and entered in 2022. It's just how they do things.