The Amazon Appstore listing mentions Android 4.1 as the minimum OS requirement, so it should be possible to run RetroArch even on Fire HD tablets from several years ago. However, it's not a big deal since there is already a Windows version available on Steam.
This also means that the Android port of RetroArch will likely be available to Windows 11 users through the Amazon Appstore/Microsoft Store partnership. But with the official availability on the Amazon Appstore, users won't have to resort to any such workarounds. Earlier users had to sideload the APK from RetroArch's website or install a custom ROM with Google Play Store services. In a blog post on Saturday, the team behind RetroArch announced the availability of RetroArch on the Amazon Appstore, allowing users to emulate retro games on Fire TV dongles and Fire OS tablets.