>>As long as wages raise as well, it's not a problem. You shouldn't compare prices to prices 100 years ago, but purchasing power 100 years ago to purchasing power now.
>Wages don’t seem to have raised at the same rate at all.
Figure 1 from that link is compares actual income with "projected assuming no growth in inequality"... whatever that means, not inflation.
Figure 2 compares hourly compensation with productivity, not inflation
and on and on...
Real wages (ie. inflation adjusted) has gone up, albeit slowly[1]. Even your link suggests this. "Stagnation" implies staying in the same place, not falling behind.
https://www.epi.org/publication/charting-wage-stagnation/
Weirdly, most graphs start getting off in the 1970s when the US left the gold standard. This is to be expected due to the Cantillon Effect.
https://river.com/learn/terms/c/cantillon-effect/