That was a different Android application, this one is for iOS.
Unfortunately Screen time APIs that Apple provides are rather limited compared to Android, but the app still does it job by preventing you from spending too much time on social media.
I was inspired to write this post by this one lol.
I don't read Hacker News and my friend just sent me the link to the post you mentioned and told me that it's similar to what I do)
But actually apps have a lot of differences.
I built it for myself first and it helped me a lot, so I decided to share it with the world