Vulnerable
Most children speak it, but its use is restricted — often to the home.
UNESCO’s own term at this grade is unsafe (grade 4): “Most but not all children or families of a particular community speak their language as their first language, but it may be restricted to specific social domains (such as at home where children interact with their parents and grandparents).”
UNESCO’s later atlas presents this level as vulnerable, and that is the label this Atlas uses. The substance is the same: children still learn it, but the language has been pushed out of some of the places it used to live.
Domain loss usually precedes transmission loss. A language that survives at home but not at work, school or in public has fewer occasions to be worth passing on.
Where this sits
The first four run from least to most endangered. The last two sit outside that scale.