Zillow Home Value Index Accuracy

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I have always taken the zillow zestimates with a half grain of salt as they are not accurate at all.  What I am curious about is the accuracy of the zillow home price index too?

At the early months of the pandemic, zillow's index was was showing prices had drop -2% over a year (even accounting for 2019) and were forecasted to go down -4% 1 year into the future.  

Now all of a sudden within the last 6 weeks zillows home price index totally changed and there was no dip in prices and the forecast is positive going into the future (quite high 8%)???

In everyone's opinion is this accurate?  Are their any other home price index's to compare it too?