I don't know what you are talking about. Did you read the article? It was communicated by Google too [1].

ONE TIME, you go to the developer settings, you do the confirmation dance (wait 24h and whatnot), and at the end you choose to "allow indefinitely".

Then you will be able to install unverified app... indefinitely. Indefinitely meaning forever, not "until the next install".

[1]: https://android-developers.googleblog.com/2026/03/android-de...