I have the objects from Miele BIM from several years ago before they were LCF containers and they were detailed to show exactly what the model of appliance looks like in 3D, the new ones currently available are a huge step backwards from the original set up and are basically useless.
I Just had the same experience. Incredibly disappointing. Add to this no DWG files for elevations etc.
We are using ArchiCAD 19 and we only see two cubes in the library display window. One for the oven and another one for the clearances? It rendered as a balk box too.