"located to within a 5km zone" sounds like an oxymoron.
Either the recorders have been found or they haven't. In the absence of some kind of acoustic contact, it's a bit of a stretch to refer to a newly defined search area of 5 kilometers as having "located" the target(s).
Has something perhaps been slightly lost in translation from a French language briefing? Or have they identified a debris field?
Are they still in an area search mode? Or have they moved on to the contact investigation phase?