One thing the raw numbers don't take into account is ratings inflation. Look at Karpov for example. In 1979 he was the only player in the world rated above 2700

One thing the raw numbers don't take into account is ratings inflation. Look at Karpov for example. In 1979 he was the only player in the world rated above 2700. Now there are almost 50 players rated above 2700. So it's much easier to have a high performance rating now. For most of chess history it was simply impossible to have a performance rating of 3098. The article doesn't take into account ratings inflation because it's more interesting to present your article about the best performance in the strongest tournament ever rather than a very, very good performance in a very strong event.