That is only for Xbox and PS DLCs. All Steam DLCs are great unique items that cannot be obtained any other way. The item they are talking about is the Golden Grasp which is similar to the Jeweled Gauntlets but gives bonus damage against stunned enemies instead of blind enemies.
I believe some players have been able to recover the items. Try to send a ticket through this link: https://puzzlequest3.zendesk.com/hc/en-us/requests/new