Continuing the discussion from Survey points random shapes:
The file you shared, BROMHOF1.skp, was not geo-located.
By default, every model has a Location, even when the model is not Geo-Located.
That default location merely gives the shadow engine necessary data to work with.
Unless you changed things, your KMZ ended up at SketchUp’s default location:
You can geo-locate the model via Window > Model Info > Geo-location > Add Location
Window > Model Info > Geo-location > Set Manual Location
The Add Location method imports a Google Earth Terrain model and a flat, single face Snapshot.
If you don’t need the terrain model, do not bring it in; geo-locate the model manually.
Best practice: Never bring it into the model things you don’t need.