Edward mentioned “the overall height of the machine” so I would assume that’s including the baseplate & feet (but I don’t have a Z-plus so I can’t tell for sure)
That said, I’m with Andy: I am now on my third iteration of redoing my enclosure because it was not high enough. Unless you have a very good reason to optimize height aggressively, give yourself a foot of margin or more, your future self will thank you!