This new index is now being updated here, I’ll add this to the wiki. Notice how it compares to the trough of the Financial crisis.
Read this article to understand more about its construction. Its designed to show more immediate and high frequency estimate of GDP “growth”.
The data its based on is not subject to revision. Its a deep plunge because recessions do not usually start with a contraction in consumer spending let alone a stoppage. I suspect the numbers will get worse as long as the shut down persists because of reduced business investment and other second or third order effects that ripple through the economy.