LOL. And "those" people have had too much eggnog. ;-)
That's like saying if a Christian missionary brings the Gospel to a remote place and persecution of Christians follow there, then the missionary must have been sent by the Devil. Satan is always trying to interfere with God's plan. What's new about that? It was God who organized the universe, not Satan. If the heavens give signs, God is the author of the message, not the Devil.
I'd suggest reading the info at the site.
Only if you equate the Magi with missionaries, rather than, say, fortunetellers.
Not that I believe any of it either way. Merry Christmas!