Yes, the resolution of the bet is "Resigns and permanently leaves office". I've previously mentioned that it's not the safest bet due to that limitation, but at the same time I think there's a 99% chance he won't finish the term for any reason (almost 3.5 more YEARS dude), and out of that sure bet there's at least a 50% chance that he will specifically resign rather than go through any kabuki impeachment (why would they impeach their own man? why would the permagov show their asses like that?).
The options are:
1. He basically drops dead or becomes comatose without even the ability to sign a resignation.
2. He is forcefully removed from office with all the commotion that entails.
3. He resigns due to a confluence of health and political factors.
Right now the bet pays 4:1, I think the overall odds of resignation are at least 50:50, therefore it is gud bet
Edit: By the way the smarmy blue loyalist smarms on predictit are glad to buy up these bets and talk shit while they're doing so. Imagine betting UNDER even odds just because you love globohomo and hate orange man. I made a few grand placing fairly obvious bets in the election, the only bet I took up the ass was GA, and that was super close anyway.