for Christ, but still, the normal meaning in the Bible is those who oppose Christ, who are against Christ, even if they don't want to substitute for Christ. Look at 2 John 7, all those who claim that Jesus has not come in the flesh are antichrists. So this was true of some sects, already in the first century, and became prominent in the second century, they taught docetism, the doctrine that Christ only seemed to have flesh, but in reality had no flesh, because flesh is evil. So he only seemed to suffer on the cross, but he was spirit, so he felt no pain. He simply did not come in the flesh. So John pointed out that this is an evil doctrine, really opposed to Christ, so those who teach it are opposed to Christ, they are antichrists.
On the other hand, the popes have historically preached the gospel, regardless if they were personally saved or not. So they did not oppose Christ, were not antichrists. They might be living in sin, but they still preached Christ. Similarly EVM, though he lives in sin, in luxury, in a mansion, he still preaches Christ.