Stukov weighted pustule status should stay on deathwing (even if it doesn't slow him)
minor_correctionThe simple fix would just be to make the status effect stay on all unstoppable targets (without slowing them of course), just like e.g. living bomb, lunara poison, chen keg smash etc.
This should have been the focus right from the beginning of your post - this isn't about Deathwing, this is about Unstoppable vs Weighted Postule.
FuenteYour prayers have been answered:
From the PTR patch notes: "Stukov Fixed an issue where Weighted Pustule was removed by Unstoppable.