Read the interview again. He states clearly that Devdasam act bestoes him rights to become supreme in terms of religious rituals. And he is performing that as his duty!
As far as who is Hindu, he clearly stated law which got changed 30 years back , effects ONLY Property, other rights. IT CANNOT TOUCH RELIGIOUS RIGHTS!
Period.
CPIM knows it will bite dust in the court. So, they are using these propaganda to derive caste mileage out of this. Plus, there are many minorities who appreciate CPIM;s histility to Hindus.