Right, so Del just basically said "Hey, do you want to believe me, a mafia player welll known to be amazing, or lom. Go on, choose, I'll wait"

Really, all Del has done is make a false claim and is now trying to win the game with it, knowing that there is no way for me to refute it because anything I can do can be counted as a lie or a trick. I could claim, but it won't do any good. Del knows this, that's why he did it.