Deflationary things are fixed assets, not currency.
I would be more inclined to get behind a cryptocurrency that correlates liquidity with value.
That's not to say there isn't an argument for inflationary currency. But that argument is centered around the ability to conduct counter-cyclical monetary policy to stabilize the business cycle.
But it's silly to say that deflationary assets are literally impossible to serve as currency, because we have actual historical evidence of deflationary currencies.
That could possibly be built. It's software defined money so it can do anything that can be expressed as a pure function of its state. You could probably make a Keynesian cryptocurrency that dropped money from helicopters when velocity was low, but it would be hard to design it so it wasn't easy to game via wash trading.
(Who says the money supply of USD wasn't too small pre-money printing?)
Actually, if Austrian economics youtube videos were real and inflation was horrible, then switching to crypto would not make you safe - because your government can't control what currency citizens trade in anymore, it can't stop someone else from inventing a popular currency and then suddenly inflating it.