My Android tablet seems to be supported and updated after all, because the Migros app there has the version number 5.2.0 (129), just like on my cell phone.
After a new installation or when you log in to the app again, the receipts from the last six months are displayed/downloaded. From then on, it is possible for the receipts to be saved retrospectively for longer than six months. However, we simply guarantee the last six months. Thanks @Frederica for the screenshots. So we were able to clarify this;-)
About the tablets:
Please excuse the unclear statement, I am happy to clarify. By saying that we do not support the app on tablets and iPads, we mean that we cannot offer support for it in the event of any problems. Certain functions are not available on tablets (GPS, high-resolution camera, etc.), which means that the app is not fully usable.