armitom: All the DLC in Absolution are for the Contracts mode, which is no longer supported (the servers are offline) You cannot play contracts mode anymore (even offline) so the DLC (even if they were included) is useless
None of the DLC is usable in the Campaign/single-player mode, (you cannnot select the adam jensen outfit/weapon and play any mission)
Sniper Challenge is missing however and would be nice if they could include it.
Since Contracts is removed, the weird thing besides the missing DLC is that it makes every in-game unlock in the single-player campaign useless as well. This since all the unlockables were only used for the Contracts mode. Literally removing any incentive to replay the campaign to unlock all the things. At least I currently find myself in the same position. It's fun to play again, but I'm missing something.
Good to know it's the same on Steam, but annoying they bothered to remove the content/menu instead of just allowing it to be still played 'offline'
Technically, Sniper Challenge is in the exact same boat as Contracts mode. It had servers, doesn't really need them since you can still play the game fine without leaderboards as far as im concerned. It's just that they should
allow it, instead of just ignoring it completely.
Hopefully they can fix both since Absolution is like gutted 50% of the game, and Sniper Challenge would be fine to play, even without servers to track your points.