My opinion:
The Antichrist will wield the power of TRUTH -- truths that were mocked and suppressed before, but he will prove them to the world.
He will be intelligent and charismatic, and perhaps will have some demonic power to boot.
But just think -- he will be able to prove to the whole world that the earth is flat. Imagine the impact to the average person! When faced with the evidence, everyone getting on board -- what would that do the average person, psychologically?
Think of how the average person will treat the Catholic Church meanwhile, which was "in on the deception" or didn't do anything to dispel it. Ditto for all other political parties, etc. Everyone was at least SILENT in the face of the deception, and did a crap job of debunking evolution (being mathematically impossible, etc.)
In short, the Antichrist will lead everyone away from foolish atheism, and people will be so blown away (and looking for answers) that he will step in and give them the answers. Bad answers, leading to worshiping lucifer and himself, but answers that people will sorely need.
He will expose Noah's ark, show the hidden location of various long-lost things (which the devils know the location of), etc.
He will expose the network of pedophilia and cнιℓd тrαffιcking within the (conciliar) Catholic Church, all modern governments, etc. The people will then be PUTTY IN HIS HANDS.
In short, he will OWN (destroy, soundly debunk) the religion of Scientism and take the spoils (all the people) for himself.
Most of the truths the Antichrist will prove are already out there and spoken today, but by people who are marginalized, ridiculed, and without a platform. He will have the truth AND a worldwide platform. He will unite everyone together under himself, smashing everyone's false reality at once, and building up another false reality with himself as god.
My point? Every Catholic who already knows the WHOLE TRUTH and that includes earthly matters, is one less person who will be blown away when the Antichrist reveals it. So yes, having the truth is very important!