That's not a fact. Money
can and will be created out of thin air regardless if your monetary system is built on central bank money, gold or even bitcoin.
A naive example:
Alice has a gold coin. she walks to a bank and makes a deposit. Now she has one gold coin in her bank account and bank is holding her coin.
Now Bob walks into the bank and says that he needs a loan of one gold coin to buy things. Bank happily lends the coin received from Alice to Bob.
Bob walks to Alice and buys things from Alice and gives the coin to Alice.
Now Alice has one gold coin and another gold coin at her bank account. Total amount of money she has is now two gold coins, even if only one gold coin exists in the whole universe!
And yes, that money at her bank account is as real money as money nowadays gets. And yes, the truth is even more weird, you do not even need to circulate the money as in the naive example, banks can and will just create money out of thin air to people's accounts. After all, the money at the account is literally, literally nothing more or less than a way for bank to say that it will pay you money some later date if you so wish. To make that promise, you do not need any money to exist anywhere. Even I can do that promise on any imaginable currency (what that promise is worth is another discussion). And as said, this has absolutely nothing to do with what "base money" the monetary system is built on. And of course, this is the reason why financial system is so heavily regulated.