Hyperinflation is what happens when banana republics print their entire money supply a hundred times over every year.
How much inflation did we get from QE in 2008? In 2009 the rate of "inflation" was negative, and the Fed has been hitting the low side of their low inflation targets for more than a decade since, despite more rounds of QE and maintaining historically low interest rates. Meanwhile the entire world is hoarding US dollars (which causes deflation) because of this coronavirus.
The number of dollars we would have to print to unintentionally get hyperinflation right now is difficult to even imagine. We could print trillions of dollars and be lucky to get regular inflation.
Crashing money velocity and vanishing credit. Inflation is a function of money supply and money velocity. Money supply is central bank money plus private money (e.g. checking account deposits) plus credit.
Demand destruction, like what we're seeing now, causes money velocity to plummet. That affects lending, which causes credit to plummet. (If we got into a credit crisis, it would cause private money to plummet.)
The increase in central bank money simply paled, even in 2008, compared to the destruction of credit and reduction of money velocity. As such, we actually experienced deflation while the central-bank money supply expanded. Because the total money supply, relative to the economy, contracted.
To get technical:
* https://en.wikipedia.org/wiki/Zero_lower_bound
* https://www.nytimes.com/2020/03/07/opinion/the-case-for-perm...