Doesn't matter what the page says. You can buy an iPhone and just press "Skip" during set up. Easy.

You can't install apps though, which for many people may as well be "you can't use the phone"

You can make and receive calls, you can use the browser and web apps to do everything you need to do online.

So it's not correct to say "you can't use an iPhone without an Apple ID" in any sense. People should be SPECIFIC.