anyone knows about the attacks this is taking about

Those who think that Babasaheb Ambedkar was against Communism or Marxism are grossly prejudiced. Ambedkar’s relationship with Marxism was enigmatic. He defined himself as a socialist, not a Marxist. But he was impressed by the élan of the Marxist tradition.

However, it is also true that he had serious reservations about accepting certain theoretical postulations of Marxism. Vested interests amongst the Dalits, however, pitch Ambedkar firmly as the enemy of Marxism. The fundamental category of class, through which Ambedkar viewed human society, has therefore been a complete taboo. Communists, on their part, have responded in kind, attacking him and his ideas.

source: https://1804books.com/products/india-and-communism?pr_prod_strat=jac&pr_rec_id=0487328ea&pr_rec_pid=8262530957541&pr_ref_pid=8318476615909&pr_seq=uniform