And to expand on what Leilleath posted above, the Blue post was from February 2022, while the new policy with the Trade (Services) channel was introduced in August 2022.
As you can see, the Trade (Services) channel is for “searching and advertising services like raiding, dungeons or PvP activities”
GDKP advertisements go into the Trade (Services) channel and no other public chat channel. LFG is not for those activities.