What's seeman hoping to achieve?

I came across news about Seeman criticizing Periyar, claiming that Periyar endorsed sexual relationships for gratification, including with family members like one’s mother or sister. I tried searching for evidence to support this claim but found nothing relevant. What is Seeman even trying to achieve by spreading such misinformation in the mainstream media? Did he really think no one would notice such a serious accusation? I attached the YouTube link below https://youtu.be/8kGecQxtG_w?si=uSi_xKHYn04kIBaP