From what I gather, that is correct.
Is this screen shot taken with the UC mixer bypassed? That’s what I want to see (screen shot with the UC mixer bypassed).
Ultimately, I do not have the 192 model (I have the 192 Mobile model) so I would be guessing about how to use the 192’s DSP FX and Cubase’s control room at the same time.
I see that you posted this same question on the PreSonus forum. I hope one of the PreSonus experts over there will answer your question. If no one from either of these forums can assist then I would contact customer support at PreSonus for the answers.
If you do get the answers please share and post them on both forums. Thanks 
Regards 