Hi Rolf,
you got it perfectly! And there are no CSW´s, that are "not-trainable", only owners, that don´t know how to train or are lazy.
Myself, I bought my second CSW from a kennel, where the mother is a bit shy and none of the parents passed any training tests. But the puppy was perfectly socialised by the breeder and then by me and now she is 5 months old, knows the basic commands and even barks at command
Also she guards the house all by herself, without any training.
So it is really not about the wolfdogs, but only about their owners
Good luck to you!