For what it’s worth, i just used the “add to Home Screen” feature on my phone’s web browser (from my instance homepage) and it’s working great. Indistinguishable from a normal “app” experience. In my case Safari on iOS but i doubt it matters.
Edit: looks like this:
If I were implementing this nefarious Reddit I probably wouldn’t have edits wipe out the original Tatars data. It’s certainly not necessary to implement edits that way.