I have no problem seeing the artefacts on both my 2012-era displays. One of them is a rather good at the time 30" 2560x1600 IPS monitor, the other is an entry-level 27" TN 1080p TV.
So I don't think display quality really is the problem here. Maybe the drivers, or post-processing filters. Or maybe everyone doesn't have an eye for this.
I have an interest in image processing, and that's the kind of detail one tends to notice with experience. The author of the article is undoubtedly more experienced than me and noticing these details may even be part of his job. He most likely will be able to notice these problems on crappy monitors, as well as telling you in which way that monitor is crap.
So I don't think display quality really is the problem here. Maybe the drivers, or post-processing filters. Or maybe everyone doesn't have an eye for this. I have an interest in image processing, and that's the kind of detail one tends to notice with experience. The author of the article is undoubtedly more experienced than me and noticing these details may even be part of his job. He most likely will be able to notice these problems on crappy monitors, as well as telling you in which way that monitor is crap.