Not true. There are already tools to manipulate physical matter at nanoscale level.
See this wiki article: https://en.wikipedia.org/wiki/IBM_(atoms)
I was buying physical gold on auction sites. I managed to buy some cutlery and some coins. Do you know what I found out? It is immensely difficult to know if I did a good deal.
For an ordinary person like me, it is very difficult to prove the quality and veracity of gold. It is obvious that there are several methods, but they all involve some work. So having physical gold to transact means a difficulty when making small transactions.
This is historic. There are several companies that attest to the veracity of gold. But you still need to trust them. It's all very complicated.
So whether it is possible or not makes little difference. What drives gold markets today are virtual transactions. Certificates issued by banks. And in that the Bitcoin decentralization and its verification process is unbeatable.
You can prove that you have the ability to move something unique and that no one else has power over it.