Helps to show that it's not an effect dominated by the very rich, and thus throwing off the average, and also that it's not that hourly wages have stagnated but people work more hours -- since they're broadly similar, we should feel strongly that it is a real increase in "normal people's" actual wages.
There are more data available if people want to look for it. This is a surprisingly complex subject for something that initially sounds simple, so it helps to get a few different views into it, but the upshot is: since the teens, people have been paid more.
EDIT to add: People are just slow to update on this. If you look at the world in 2014, then it seems a lot more reasonable to be skeptical that normal people will ever get a raise. Then, you'd had basically 15 year of stagnation, before that a little rise, and then more years of stagnation at a lower level.
The overall median for non-supervisory workers in the United States, not just tech. I'm sure that there is some industry that has had hard times in the last eight years, but overall we've seen growth.