It's because Google changed versioning required in the app store, starting Nov 2022. Since I downloaded it before then, I got in before this new requirement.
https://stackoverflow.com/questions/755 ... der-versio
Starting from 1 Nov 2022, apps that don't target an API level within two years of the latest Android release (API 29 and below) won't be available to new users with devices running Android versions newer than your app's target API level. This means that new users won't be able to discover or install your app on Google Play
The app works on android 12 & up...but the dev would have to reupload it to the store with a newer API target to get past the issue.
considering it's been in version 1.0 since forever, I'm not sure this is a priority for the developer. Wasn't the dev a Chiffer? I seem to recall that from years and years ago but I can't be certain.