just in case you hadn't come back, no, it didnt, the DLC is a collection of images etc with no apparent scripting tie ins, so perhaps the scripts are missing or something else is (as ObservantShadow pointed out the game images are also webp's not the photoshop etc stuff), so at best it may be...
makes sense, the images etc didnt follow the folder structure of the game so when I tried it nothing happened, because, as you said, no script to call the assets. So ATM the DLC is just .... files :)
yeah, that goes for me as well, checked the file structures and couldn't see matching, I'm about to guess it may just go holus bolus into the game folder of the main... maybe?