Okay if we're going to get pedantic about Wrath Gate VS Battle for Undercity.
Yes, you can still watch Putress bomb the Wrath Gate. BUT
1. The questline aborts immediately after that, you don't get to see the resolution of Putress' arc in BfU.
2. To even view it at this point you have to think to do questing in Dragonblight, which most players won't do unless they are Chormie Timeing into Northrend.
3. It's literally never been followed up on again since being the entire focus of the opening cinematic for Undead. To the point that a chunk of the team has just forgotten a coup ever happened.