I see that there's an updated requirement for iPad screenshots (iPad 13"), but there's no info on the screenshot specs page and the device bezels are outdated
iPad Pro 13" screenshots for the App Store
I can see the requirements for 13" iPad from the link you provided.
The App Store Connect API documentation still doesn't list the new iPads: https://developer.apple.com/documentation/appstoreconnectapi/screenshotdisplaytype
When adding screenshots to 13" iPads on the website, they still seem to use the display type APP_IPAD_PRO_3GEN_129 when listed by the API, and uploading to that same type uploads them to the 13" display type instead, and then there is the requirement that one still has to upload screenshots for 12.9" display type, without an apparent way of doing so. I would expect to have an option to upload to 13" display type that is also used for 12.9" display type as well.