Wow are you smart!!!!!!!!!
Anti means "a person who is opposed to something." The phrase you are misremembering as in the place of Christ is "alterus Christi."
So according to your logic, if the Vicar of Christ is the anti-Christ, that would include all of them including Christ's hand-picked successor Peter!!!!!!!!!!
So Peter was the anti-Christ!!!!!!!!!!!!! Wow!!!!!!!!! Who'd ha' thunk it dude???????????????