What Does The Ending Of Suicide Squad Really Mean?
8. Who Is Dead (And Who Isn't)

Slipknot is killed almost immediately during Task Force X's mission to retrieve Waller, when Boomerang convinces him the neck bombs are a bluff and his head gets exploded by Rick Flag. RIP rope guy.
Diablo sacrifices himself during the battle with Incubus after unleashing his beast everywhere. He takes Scott Eastwood's soldier GQ with him, who had swum with Killer Croc underneath the station to retrieve a bomb that had handily been left by Waller's first idiotic attempt to take down Incubus. The one second timer did him in.
Incubus is killed by that bomb, which is a bit of a cop-out, to be honest.
Then Enchantress is defeated when Harley Quinn pretends to side with her, but distracts her long enough for Killer Croc to throw the bomb vest and Deadshot to shoot it, despite Enchantress making his daughter appear to him to emotionally manipulate him. The slow-mo here is on point.
And that's it - Amanda Waller, The Joker and June Moone all survive definitely fatal incidents, and everyone walks away with scratches to fight another day.