[forkLding]

Uyghur language isn't banned in China, it's part of all the signs and official documentation. There are more Uyghur-Chinese documentations, dictionaries and references than in the West as explained in this document's preface. It is easier to practice Uyghur in China than in the West as again referenced in the document because there are less resources in the West or specifically the English-speaking world.

Should be noted that Uyghur is not descended off Old Uyghur but rather the Karluk languages. Yugur is the descendant of Old Uyghur.

[Aromasin]

I think the point he's trying to make is that while what you say is presently true, newer Chinese policies seem intent on the suppression of minority cultures (and by an extension of that language); especially of the Uighurs. Perhaps what I've read is just anti-china propaganda, but it's a running theme across multiple different media outlets.