That is actually Tee'd off the "Power Beyond". That is generally the 3-point hitch lift unless the backhoe is installed. This is the "normal" way to do rear remotes.
What intrigued me about the other install is that is was quick to install/remove since it actually used the backhoe PORTS. It would have to be removed when the backhoe was installed, but that is ok with me since generally remotes aren't used with the backhoe on anyways.