I feel like there are many different morals and narratives to this story. The US abandoning a gold standard in 1933 is certainly relevant. The rise of the US dollar as a global reserve currency in 1944. To nation's like china working to undermine and replace the US dollar as the reserve currency in 2021. I've seen charts claiming average worker productivity from the 1950s to the present having almost doubled. While the average working day could be longer today than it was in the 1950s.
There are many different trends at work. Different dimensions which make analysis complicated.
The correct comparison would have been to have a stack of ~500USD on the right side, but that doesn't convey the pro-gold dogma as clearly.
If inflation metrics were accurate. Wouldn't there be $1700 stacks on both sides of the table?
One potential explanation for only $500 on the right side is inflation metrics being under reported. The way unemployment and virtually every other vital statistic has been under reported for decades.