The Count is rolling up the number of times a field in the input occurs.
In your example, there is no field in your input named “status” so the count is zero.
The split-by will give you groups and you’ll get a count of the field in each group.
Also note that it’s just counting whether the field is there. It has nothing to do with the value of the field.
Here is an example you can run that shows a summarization count of an “alert” field that is in 2 of 3 input items matching group 1, and 1 of 5 items matching group 2. The split field is (cleverly) named “group.”
Please mark this as the solution if it answers your question.