How is that an 8K video? It seems like it's only available on YouTube as 1080p (60fps). It was shot originally in 8K sure, but it does not look particularly impressive on my 4K monitor.
Incidentally some videos also have VERY low bitrate encodes that also aren't shown to most users by default. This particular video goes down to 256x144, but sometimes you see even smaller, particularly with a reduced framerate.