And the data for the two decades before that obviously needs to be tossed out because of the one-off nature of the dot-com boom, the dot-com crash, 9/11, and so on.
And before that... point is, you don't get clean data in economics. There's always something big going on, there are no double-blind trials to run, etc. It's called the dismal science for a reason. But that doesn't make it useless.
There will always be something going on, but there won't always be this specific thing going on, and if 100% of your data comes from during one specific crisis (nonetheless multiple concurrent crises), then it is 100% useless. Even with longer periods of data, reconcilliation with longer trends is technically challenging. We've had enough recessions to correct for them in our data, but until we've had a half dozen global pandemics you can't use pandemic data in your analysis.