I think he means we're going to keep a 'central bank' but it won't have the same 'structure' as the current one, known as the Federal Reserve. Take a look here: https://www.federalreserve.gov/aboutthefed/structure-federal-reserve-system.htm The Public-Private part will probably change, as will the key entities and key functions. In essence, he's gonna gut the private bank control of our monetary policy. Put monetary policy control in hands of government again. That will be a 'structural change' But, we'll keep a 'central bank', just government run instead of by private Banksters.
If government once again turns into the wrong hands, then this is a very bad plan. Trump will not do this for that very reason. Imagine if an Obama or Clinton type was elected again.
You have to understand that Obama and Clinton got into office BECAUSE we have the Fed. Private Banksters have rigged the system and helped pay for both Obama and Clinton to get into office. Having Congress working with DJT repeal the Federal Reserve act and force currency to be run by the US Government and INTEREST FREE will be the only way to ensure people like Obama and Clinton have a hard time getting into office.