Yes of course , all the barrows brothers are working , and they drop barrow's items ofcourse. And its fully 100%

 

The objective of the Barrows minigame is to defeat the seven Barrows brothers: Ahrim the Blighted, Dharok the Wretched, Guthan the Infested, Karil the Tainted, Torag the Corrupted, Verac the Defiled