SLP2000: Ubisoft released some of their new games on GOG.
HOMM5, PoP, AssCreed.
Those were released around 06/07. that is nearly six years ago. They had their shelf life, releasing them now DRM free is not an issue for Ubisoft.
Publishers still are reluctant or simply unable to release any new (less than 2 years old) titles DRM free, for various reasons.
The mail stated "There are a number of THQ games that interest me and I would most certainly like to purchase them. Nevertheless,none of the THQ games I wish to buy are
currently being sold on GOG.comand thus I would like to inquire as to
when THQ will be offering their titles on GOG.com as this is my retailer of choice"
For me this doesn't read like "where are the old games?" but more "why don't you sell your game also here?".
My understanding might be wrong, but this is very well how the guy answering this read this.