Any reference to "future events" relative to the subject - specific events relative to the subject, may surely be speculative in nature.
It's just not that much of a stretch (for me) to believe that many will be deceived by lying doctrines of demons. Paying heed to seducing spirits, and all that.
I realize people's mileage may vary....
But (for instance) when dead Aunt Tilly appears to say; "Christ is there" ....it will be a powerful deception, even to the elect.