Dreamerdude, no...they don't. They don't need the revitalization of the language but the WT does in order to get funding and positioning.
Here is a 'funny' story. A few years back, I lived in a semi-remote almost Northern town in Canada. The town had a fairly large Indigenous population and the JWs actively pursued them both in town and on the surrounding reserves.
My neighbor would get WT literature written in Cree. We would sit and laugh at the "white natives" in the illustrations. I asked her, "Do you know anybody that reads Cree?" She laughed, snorted, and said "No". The language is not read in the communities and the dialects are so varied that the WT literature is, well...useless. Cree is not the only indigenous language spoken in their communities.
I wish I had kept the Cree Bible Teach book (I think that was the publication...) and had taken it to the university to get analyzed for appropriateness and accuracy of translation. It gets me a bit riled to think of the indigenous population being targeted by yet another pedophile loving cult. They are a people who have deep wounds from the residential school abuse and here we have another religion with pretty pictures and promises, another religion that protects child abusers, inserting themselves into a vulnerable population.