On stream they are doing Delera's and two tips:
In part 1; the bones on the floor in the last part are triggers for the gates and undead. Don't touch them, no trap/ambush.
Part 2; the notorious room that stays locked for a long time. The spawn will have two types of mobs; ghostly and archers. Kill whichever has 3 first, then kill the set that has 2. So if it spawns 3 archers and 2 ghostlies, kill the archers first, then the ghostlies. If it is the other way around, ghostlies first, then archers.