A bunch of devices lost support with iOS 13. I don't remember offhand but a quick search shows that the iPod Touch 6th Gen was discontinued the latest of the iO

A bunch of devices lost support with iOS 13. I don't remember offhand but a quick search shows that the iPod Touch 6th Gen was discontinued the latest of the iOS 12 supported devices. It was sold through mid 2019. So I think that's why.