rob006 Sorry, I probably didn't explain very well.
All the DLCs in my Steam account are listed in my collection page on GG ( https://gg.deals/collection/?type=2 ) .
But they're not linked to any launcher ( no DRM icon ). Every item has the link "Add new launcher".
It doesn't seem to be a problem of some specific DLC.
This is a non comprehensive list:
The Witcher 3: Wild Hunt - Expansion Pass
The Witcher 3: Wild Hunt - New Finisher Animations
XCOM 2: Reinforcement Pack
XCOM 2: Resistance Warrior Pack
XCOM 2: Anarchy's Children
XCOM 2: Alien Hunters
XCOM 2: Shen's Last Gift
XCOM 2: War of the Chosen
Desperados III Soundtrack
Desperados III: Money for the Vultures - Part 3: Once More With Feeling