Because grandparent said they would sacrifice a realistic tax increase to save lives in the COVID-19 outbreak, the parent asked about a confiscatory 99% tax rate and asset seizure, which would be wholly unnecessary for paying for the current crisis.
I don't see how the original comment was unreasonable in asking what is the threshold where economic losses are too high. Halting all economic activity to completely stop the spread of the disease and prevent deaths amounts to a 100% taxation since you are forced to not work and generate revenue. Whether that is acceptable or not isn't my point, but asking the question isn't a fallacy