Z4 P0 R0 suggests that they expect to sell a decent number of those seats at some point, even if it's currently J9.

But the way, seat map is not always a good indication of what has been sold, as some people book tickets without selecting seats. Setting 16 empty seats doesn't mean they haven't sold any. J9 means they haven't sold more than 7, but anything from 0-7 is possible.