As you can see the model does not show deleted and is still visible via REST API.
Spectrum 10.2.x Spectrum 10.3.x
When a model is deleted, it is not deleted automatically, but is put on a model destruction list. The model will not be visible in OneClick but it can be viewed by the REST API, which is why it is still showing up. A stop of the SpectroSERVER will trigger the models in the model destruction list to be destroyed, and therefore after the SpectroSERVER has been restarted, then the model will no longer be visible, even with REST API.
After a SpectroSERVER stop and restart
Method Request URL Get http://<OneClick Server>:<port>/spectrum/restful/model/0x10006d2