Mainly because it's not even a depression, when storms have turned into lows, the last advisory always repeats what the storm was prior to the last advisory, most of the time it's a depression at the time, but some cases it isn't Colin is such a case. So the advisory just restates it to finalize it.

It's gone, and not incredibly likely to come back as a Storm (At least for another 6 years), the hurricane center does forecast a chance of it coming back at the tail end of the discussion, but it's not a sure thing. The forward motion of 35MPH is a clear indicator of that.