If the user doesn’t use the app for a few weeks, iOS will free up the app’s files. The icon will still be there on the home screen, and when accessed the app will be downloaded again.
Not very trustworthy for using a PWA on iOS it seems :)
I agree that better/modern PWA support was added only recently, but the actual "Add to Home Screen" option has been around since 1.1.3.
I'll admit it's been little more than a fancy way to add a bookmark to your home screen with the option to hide the browser chrome, but it's been there for a long time.
This applies to all apps, not just PWAs, and can be enabled/disabled. I don’t know what you’re quoting as it doesn’t appear in the link (apologies if it does, perhaps my ctrl+f is malfunctioning), so I don’t know if your source is claiming otherwise.
