I was also not believing because I never compared them before or even If I did I might not have given that much importance but the holders of gold must be frustrated now. There is no doubt that Gold was less volatile but the tax, and expenses of managing the gold must be huge. For example, a few days ago I saw an image saying that gold is $1.6 billion and we know how heavy one brick of gold can be in the below picture the weight and the space that gold is occupying is a lot. And the expenses like security or a vault to store them must be expensive too either it is bought or rented.
Gold is for old people who don't accept new technology while BTC can be called technological gold because but with limited supply as real gold has unlimited supply because we don't know how much gold is going to be discovered in the future but in the terms of BTC we know there are 21 million coins.

That's why the BTC has gained that much value over gold because BTC has scarcity while Gold don't.