The idea of the decline of the US as a reserve currency has been "about to happen" for me entire life, and yet another cherry-picked graph won't make it more likely.
The price of gold going up is the opposite of inflation. Hyper-inflation is when the "price" (value) of a currency massively decreases, not increases.
At least that was in my high school economics 101 classes.
I feel like commodity prices tend to get pushed down by tech improvements.
Now the crust is not liquid but it is very old and there have been lots of plate tectonics. I imagine all the shaking and scraping would be enough to get the gold in deeper.
It's interesting to note that the richest gold field we have was created when a meteorite hit the Earth so hard, the deeper parts of the crust got bent upward and lay closer to the surface (Vredefort dome).