I read about this on cointelegraph few days ago, the wallet could be real. But, it is now related to the fact that without knowing the private key of a wallet, that brute-forcing can only be a waste of time as no one can brute-force a wallet private key for now. Also, on the new, it is said that although it may be impossible to break through the wallet for now but possibly quantum computer with advance features will be able to break through in a way the private key will be revealed. Now that a recent quantum computer is used to calculate what can not be calculated in 10 years in just three minutes, this makes quantum computer to be a topic of discussion in relationship to bitcoin.
Brute-forcing to crack the private key isn't going to work. You need quantum computers for this, and if the rumour is true then although it may seem impossible to get the private keys for now in the near future this might well become a probability.
Given the stake is so high, several individual might pull together and split the reward, after all the amount is high enough to lead to different team formations alining up to the same goal.