I believe this has something to do with the difference between what the investor has predicted and what the actual market condition is.
Basically, what this means is that the market discounts the value of the contract by a higher forward rate.
Investor belives that the future spot rate will be less than the forward rate that the market has determined today.
Assuming, the investor is correct, he has basically found out an undervalued contract.
Therefore, he could buy the contract now to realise the profits at the specific point of time when the spot rate applies.
PS:- GO THROUGH THE DEFINITION OF FUTURE SPOT RATE AND THE FORWARD RATE. UNDERSTAND THE IMPLICATION OF NO-ARBRITRAGE CONDITION. THEN THIS CONCEPT SHOULD BE FINE.