status-completed, status-deferred, status-declined, etc. are Meta-specific tags that generally only refer to feature requests. They are attached to a feature request question to indicate the status of that request.
support on Meta is defined as
A request for assistance with one of the site's features.
Assistance usually comes in the form of an explanation for how something works or why it works that way. This can lead to a broader discussion, so there is overlap between that and discussion. There's nothing inherently wrong with a Meta support request leading to a discussion about a topic.
The status tags generally don't apply there, unless the support request effectively points out a bug to be fixed or system feature to be added.
