I don't know if there's any truth about the first time around (could be), but I doubt very much he's hoping to be defeated now.
When he'd never had something, he thought highly of himself for sitting with the big boys and girls playing for it.
Once he had the thing (the presidency), losing it to someone else became intolerable. How could he, he DJT, be a loser?!I
So I'd be surprised if he were capable of just walking away from the presidential race.
(But as discussed earlier on these threads, and by Rachel Maddow, he may be expecting to acquire the role by other means than by people voting for him.)