Mild expression of curiosity, since I'm not sure if this'll be useful for me (I'm in AU): this is listed as "requires Android 6+", yet shows "Does not work on y

Mild expression of curiosity, since I'm not sure if this'll be useful for me (I'm in AU): this is listed as "requires Android 6+", yet shows "Does not work on your device" for every single device listed, including my main phone which definitely isn't that old. But it's not showing "not available in your country".