I attempted your same test WITHOUT success.
To be sure it does not depend on my installation of the OS or of the INDI library, I repeated the whole job using a Virtual Machine downloaded from osboxes.org.
I used again the openSuse distribution 13.2, upgraded the system, installed the required packages and then a freshly downloaded indilib sources.
I loaded only the indi_simulator_telescope driver into indiserver and tried using DCD to connect (all properties appear) and disconnect (connect properties remain visible and the interface DOES NOT return back to pre-connection situation!).
At this point I also implemented the change in the driver with deleteProperty called into ISGetProperties but, as before, the properties still REMAIN VISIBLE both in DCD and with indi_getprop.
I am going to repeat the same test within an Ubuntu VM just in case...

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