The advisory of china of buying gold and silver is pattern from their ancestors, that if they acquire certain amount of money they immediately buy gold and silver which serve as their investments that can be used ,when the time comes that it will be needed.
People are already investing in gold and silver and they have the modern investment source as well. If China is telling people to go for only gold and silver seems that they are stopping them from cryptocurrency. This is not good as everyone is feeling the success in Bitcoin and they will invest if they want profit. It is always a better decision to diversify your investment in the top sources will give you huge collective profit.
I do not see anything bad in that t China inspires its people to invest money in silver and gold. Precious metals will be always growing in price. However, younger Chinese guys prefer to buy cryptocurrencies.