BITMEX Contango/Backwardation is , act as confirmation for BUY and SELL. A change between Contango and Backwardation often highly correlated with stronger price changes.
Contango : SELL!!! (Background olor: RED)
Backwardation : BUY!!! (Background olor: GREEN)
Backwardation occurs when spot is more expensive that the and this confirms a buy and vise versa for Contango.