Location: the correct English name of the "Land Niedersachsen" ist state of Lower Saxony. Beside that: I am also not quite sure, why this language should be developing? It is hard to find young people that are fluent in this language or L2 speakers. Many North Germans like me can understand it quite well, but can not speak a clear sentence. Many "L2 speakers" have the tendency to speak a mix of Low Saxon and Standard German.
We will re-assess the language vitality of Low Saxon [nds] in Germany for the 19th edition of the Ethnologue.