The 32-bit APK repackage of the Dolphin emulator for Android refers to a version of the emulator that has been repackaged to work on 32-bit Android devices. The repackage is necessary because the official Google Play Store version of the Dolphin emulator is a 64-bit APK, which may not be compatible with older 32-bit Android devices.
You may find "repacks" or "32-bit fixed" APKs on sites like the Internet Archive dolphin emulator android 32 bit apk repack