The article you sent is not helpful - it concerns the public beta version. I have been unsubscribed from the public beta version. I also do not have a beta profile installed. Furthermore, I have a stable version of iOS installed. I simply do not want the "Beta Updates" tab to be available in Settings -> Updates. And there it still shows the beta developer version of iOS.
Rzesko77
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It's ridiculous that no one knows how to remove it.