thats because most sites do a terrible job when it comes to fitment referance. If you buy Bosch Aerotwin part number 3397014621 they will fit even if the website you are on says they won't! Just put in 2021 as a model year and order them.
Here is the site I buy them from because I am located in Canada. As you can see, according to their site they do fit. The model Y has never changed the wiper blade size since its inception by the way so 2020 to 2024 ALL use the same part.
If that does not convince you then
here is a link direct to Bosch with all the blades that fit the 2023 model Y. Scroll down to the bottom and read the number.