Yes it is pretty much fiat. But it is digital fiat which will still be controlled by central banks. And worst, with CBDCs governments can do what they please the same as they do with fiat but it would give them even more power over the common citizen's wealth than ever before. It is not the same a pure and simple cash wich you can stach under your bed. With a CBDC, citizens become totally dependent on what decision a central bank may take over their wallet.