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This source explicitly says that its the Yugur language, not the modern Uyghur language, which is the "real" "Neo-Uygur language" (as in the genuine descendant of the language of the ancient Uyghur Khaganate.
Modern Uyghur is actually descended from the Karluk "Xakani" language, it was the official language of the Kara-Khanid Khanate and was documented by Mahmud Kashgari.
Uigurische Sprachmonumente und das Kudatku Bilik. Uigurischer Text mit Transscription und Übersetzung nebst einem uigurisch-deutschen Wörterbuche und lithografirten Facsimile aus dem Originaltexte des Kudatku Bilik (1870)
Uigurische Sprachmonumente und das Kudatku Bilik: Uigur. Text mit Transscription u. Übers. Nebst e. Uigur.-dt. Wörterbuche u. Lithograf. Facs. Aus d. Originaltexte d. Kudatku Bilik By Ármin Vámbéry
Uigurische Sprachmonumente und das Kudatku bilik: uigurischer Text mit Transscription und Übersetzung nebst einem uigurisch-deutschen Wörterbuche und lithografirten Facsimile aus dem Originaltexte des Kudatku bilik By Yūsuf (khāṣṣ-hājib), Ármin Vámbéry