True to an extent but there are other things that are done far better on certain phones, the main thing for myself being exposure and dynamic range, which is why I love the nexus/pixel/google HDR+ mode so much.Without a control (say, a DSLR) it's impossible to tell which one is accurate. All you can tell from this is which has the highest effective resolution, and even that is hard because even at 4k (as I am watching) YouTube compresses the hell out of it.
I picked the Pixel XL and had the s8 in next to last place - the video is right though, this is all about personal preference, colour temperature and the like and not really about quality any more