Why would they suddenly become correlated when it wasn't the case in 2019, 2018 and of course 2017 
... manipulation via leverage of cash futures makes it inevitable that powerful (government money) forces who would rather BTC didn't present a haven for fast money looking for uncorrelated assets in times of crises.
... they've been doing this with gold and silver since LTCM derivatives implosion and the Asian financial crises circa 1998