Correlation does not implie causation. The gold price is mostly made up of paper-gold valuation, which can easily be surpressed and in fact there is strong evidence that this is exactly whats happening.
Gold needs to be cheap as it's the most commonly accepted save-haven store of value. A low gold price therefore indicates that everything is alright and keeps the masses calm.

Bitcoin on the other hand tends to rise during economic uncertainty, mostly not because its seen like gold but for its capabilities to hide and move any given amount frictionless around the whole globe.

So the correlation can very well be explained by assuming that bitcoin is rising the most at exact those times when gold needs to be supressed the most for persaving more widespread panic.

I'm fully aware that this conclusion requires two strong assumptions and I could very well be wrong, but don't let yourself be fooled into believing that two graphs that show a similar pattern are proving a direct relation of the underlying effects.