This is the stupidest hypothesis that I have heard, which has no archaeological, historical, genetic or linguistic support.
According to it, the Mongol-speaking pagan Mongols brought the Kipchak language to the Volga region, converted to Islam and began to bury their dead as the Volga Bulgarians, while the Chuvashs abandoned Islam, Arabic script and Bulgars' funeral rites(90%+ of Arabic borrowings in the Chuvash language have a Tatar source) ...
https://ru.wikipedia.org/wiki/%D0%91...#%D0%9F%D0%BE% D0% B3% D1% 80% D0% B5% D0% B1% D0% B0% D0% BB% D1% 8C% D0% BD% D1% 8B% D0% B9_% D0% BE% D0% B1% D1% 80% D1% 8F% D0% B4
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