Local field has had a NOTAM for months now regarding the RNAV approaches on both ends being NA. Backstory is the airport lengthened the threshold so runway would be technically >5000. Apparently insurance on smaller jets requires it I’m told and they get some money to do it through power of magic (govt grant?). I’m told that the NOTAM exists because the FAA has to come and officially fly the approaches after the runway length has changed-which they are behind on. It creates some interesting side talk. Legal to fly? Probably might come up if you have an accident landing at a field Using a NA approach. Thoughts?