'Tis true, Ricardo, that Michael asked Neri if he'd remember Moe, implying that Michael was getting ready to have him whacked. Though Michael did say he wanted to make Moe an offer he wouldn't refuse (even after the Vegas failure),I guess you could conclude that Michael ok'd the hit on Moe after his father refused to consider talking to him.
FYI: Moe was shot to death at the home of his Hollywood mistress (shades of Bugsy Siegel!). Neri disappeared for a month, returned deeply tanned, and Michael gave him some kind words and the living off of a particularly lucrative East Side book.