I think I agree with Trump when he said he doesn't write like that. I don't for one second think he even knows what enigma even means...
Now whether he still had someone prepare the card for him is another story. I could see the typical billionaire jerkwad ordering someone to get a card and do something like that with it so he doesn't have to do anything.
"these are not my words, not the way I talk, I don't draw."
Yes we know, you're supremely unimaginative, completely devoid of creativity, and consider art to be abhorrent.
But I don't for one second doubt you didn't have someone write it for you.