well that false information was easily debunked.Forced upgrades. Its not iOS8, but iOS18. Users need to comply with the new terms and conditions, but they are not able to with iOS17.1.1. Apple says it needs to upgrade to iOS18, before the button works.
How to keep your devices and data backed up in iOS 8 or earlier - Apple Support
If you have an iPhone, iPad, or iPod touch with iOS 5 through iOS 8, learn how to keep your devices and data backed up.