That’s why that line “if it were possible” is so important. “For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect” ~ Matthew 24:24 There’s patristic consensus that even overwhelming deception will not (cannot) succeed in the end. And importantly, only by the grace of God will anyone be preserved.