The only part that uses QT is pylotro itself, which is a python launcher for the game, since the native game launcher is .net based and doesn't work in wine. Those errors are pylotro specific have nothing to do the game itself at all. And the splash/loading screens are indeed not downloaded by pylotro, but they are loaded by the native launcher. The loading screens can be manually downloaded and installed from http://www.mcgillsociety.org/PyLotRO/index.html but have no effect on game play (or audio).
