JMich: This transpired in December of 2014. WB must have been in negotiations with GOG at that point, and probably have already finalized the contracts. Could it be that GOG has offered to do the compatibility work themselves, thus WB didn't see any point in working with Night Dive, because they are already working with GOG? If they were publishers with Night Dive Studios as developers, they would be giving a piece of the pie to Night Dive, if they licensed NOLF to Night Dive, they would be getting a smaller cut. If GOG does the work though, WB's cut would be the standard 70%.
Unlikely, but there may be hope yet.
They mention having source code for both so ND could go lot further than GOG's compatibility fixes. Unfortunately it also sounds like ND had plans to fully utilise Steamworks (not explitely mentioned but it's obvious from feature set mentioned) so games would probably become Steam exlusive. :-/