This analysis is wrong because it is focusing on a limited number of high end chips.

You can buy CPUs that cost a fraction of any of those listed that will absolutely demolish even the best chips from 6 years ago today. All while consuming drastically less power for that performance as well.

Even mobile chips over 2 years old are within margin of error performance distance to those entry level Naples chips listed, at a fraction of the cost and power consumption.

I would not call that stagnation.