Notably, a person's blood group never changes medically during the course of their life, with the exception of truly uncommon circumstances such as when they might have a bone marrow transplant or develop a rare form of cancer.
For someone who is accused of threatening tribals to not align themselves with the state and instead support Naxalites, it is indeed peachy for Sundar to pontificate what a tribal leader can or cannot do for upliftment of tribals.
Mondays are dedicated to Bhagwan Shiv, and thus Mondays falling in the month of Shravan are often seen as the holiest days, especially by Shiv devotees.