They slapped that to the descriptions of all games that were on the list of GameSpy-powered titles in terms of multiplayer. The Locomotion box art showed the "Powered By GameSpy" logo on the back, even though there was no master server and it didn't appear in the list of their supported titles
. Also, Glu Mobile was the last owner of GameSpy Technologies and they shut them down on May 31st, 2014 for being "unprofitable", nothing GOG was related to.
From a quick Google search, nobody complained on any lack of multiplayer, which means it wasn't ever cut and the note on the GOG product page is wrong.