I'd have to guess it has to do with the rest of the system merging with GATRRS without them. There was an article concerning it from April 2017 here on the forums.
City of Odessa has upgraded their radio system with a new switch while their old switch is still working with the PPBRPC system iintil they are move over to GATRRS. Therefore, City of Odessa is no longer being rebroadcast on the PBRPC system. The City of Odessa is going to full ENCRYPTION.