Very brave to selectively quote Ambedkar, especially on Buddhism and Hinduism. Let me enlighten you with his own quotes:

"History of India before the Muslim invasions is the history of a mortal conflict between Brahmanism and Buddhism"

"No wonder if Pushyamitra who as a Samvedi Brahmin was the first to conceive the passion to end the degradation of the Brahmin by destroying the Buddhist state..."

"By this proclamation Pushyamitra set a price of 100 gold pieces on the head of every Buddhist monk"