I think the chart is meant to be an approximated summary, not a precise timeline down to sub-year intervals. Even though Intel has fallen somewhat behind compared to norm, I think they should still be considered "leading edge". The "Intel 7" process (formerly known as Intel 10nm process) is comparable in transistors per mm^2 with TSMC 7nm. Really, we should all drop the "nm" naming conventions and simply go with transistors per mm^2 for a given design pattern.