Yes, I am sure. In the context provided, the use of passive voice ("the results of every single game... were accurately predicted") places emphasis on the action of predicting rather than identifying the sports analyst. This is a common reason for using the passive voice: to obscure or remove the focus from the subject or actor. Therefore, "The person who acted is unknown" is an appropriate interpretation of why passive voice might have been chosen in this case. If there are specific aspects you'd like to discuss further, feel free to ask!