This isn't a fair like-to-like test though. They used iPhones, which use one battery and then for their 120W test they used iQOO 7, which has two batteries that charge in parallel. They aren't testing the charge rate effects on a single battery, but just how different phones behave.

While it's an okay test to see how certain models of phones hold up, it's not a test for longevity of a single battery using fast and and not-as-fast charging.

So the title, as it often is these days on YouTube, is misleading.