I think you misunderstood him. He wants to trade face-to-face, and therefore this can be done in an open and safe place, such as a bank or in a public place, but who is the idiot who would think of carrying $831,000 in cash to buy Bitcoin and deal with an unknown person?
It's a very huge risk. With $831,000 in cash, You basically become a moving bank or bullion van, and you end up putting a target on your back. Don't get me started on the part of counting and verifying if the banknotes are counterfeit or not
Meeting in a public is no guarantee of security, as the bad actor can still trail the person they want to rob.