Segment with tracking code conditions

Hi, I've read several posts with the same problem as I had, but still quite don't understand.

I wanted to know how many entries were made that did not have tracking codes(and consider them as organic entries).

So I set the segment as below, to filter out entries that don't have tracking codes.

And then set Entries and Visits as metric values.

You can see that with "Visits" metric, the segment works fine.

But with "Entries" metric, Tracking Codes that don't fit the condition are also shown.

I'm curious why the "Entries" metric doesn't work, and to actually calculate "Entries without tracking codes" which metric I should use.

Thanks in advance!