I think it's just what it says. There's no harvest guideline. So, in those units, you can hunt the late season, which is January 1 to April 30, and there's no need to worry about whether the harvest guideline has been reached, since there isn't one. Most of the units with the N/A, look to me to be mostly units without much, if any, public land. So they probably don't harvest many cougars out of those units anyway.