This seems to be flat out false. According to this 78% of gold globally is used in jewelry. Some other portion is used in electronics of industry.
https://goldprice.com/project/facts-about-gold/
There’s no such reserve value for Bitcoin. You can’t look at it or hold it or do anything with it other than as a currency.
I’ve seen widely varying stats estimating gold’s jewelry share but all of them are large.