Not sure how the link is related to Jabber as Phone, and I am unsure of official support as last time I checked it was still under beta (use at your own risk) but it does work. In fact I have it working fine with CUCM 8.5.
Are you getting this error “Installer User Interface Mode Not Supported. The installer cannot run in this UI mode. To specify the interface mode, use the -i command-line option, followed by the UI mode identifier. The value UI mode identifiers...
The below trick might come handy when you have to add a new node to a cluster but you don't have or is unsure of the security password for the publisher. This procedure has been around for ages.
1) Login into the CLI of the Publisher.