There is nothing about alien communications that could contradict any key doctrine of Christianity. It they tried to contradict the divinity of Christ as God in flesh then according to 1 John 4 they are of or in league with the spirit of antichrist.That is the chief key doctrine that if it could be contradicted, the the rest of the religion would tumble. If there was no rtesurrection of the dead then Christianity has no more meaning than any other religion.
Let’s say there was “life out there”. So what!! It doesn’t change what God requires of humans...that is to confess Christ and be saved!! What God may require of other life forms who are intelligently sentient is between them and Christ!
You need to logically parse your own post.
It looks like your view is that any alien communication at odds with any key doctrine of Christianity is demonic and false.
However even if that were true it would not prevent:
—The aliens from believing such things
—Tucker Carlson from believing such things
Obviously Tucker Carlson does not want you (and people like you) to conclude his views are demonic and false.
Therefore he must keep his mouth shut on such topics.