Yes, the Cavaliers "adore" Larry Nance Jr. They're not trading him unless they're floored by the offer. This is supposed to be a weak draft so that 14th round pick probably has less value than in a normal year.
The only way I can see this happening is if the Cavs are in love with Wiseman and have a deal in place to ship the #5 and Kanter to the Warriors for the #2 pick. So it would basically end up being Nance for Wiseman, Poirier, and the #14. Supposedly the Warriors want to win this year and would be willing to move the #2 pick. They would get Kanter in exchange for dropping three spots. I'm not sure he fits their style of play and they probably can't take on his salary so maybe a contract comes back to make the money work.
I can't see a straight trade of Nance to the Celtics for that package.