“Synchronize …" and “the Apple Contacts” are simply labels I put in the menu to suggest what the other parts do.
There was a correction to the procedure that I posted in August 2019.
You’re right about other planned features. Many have been implemented in my personal copy, along with a lot more solely for my purposes. There wasn’t any indication that anyone was looking for them so I hadn’t felt any pressure to post an update. I’'ve got a good change notes though and an update should get onto my to-do list.