The information icon at the top says the database is from http://www.myneta.info/, another decent site for Indian political data.

Myneta.info looks like it is maintained by a group called The Association for Democratic Reforms (http://adrindia.org/about-adr/who-we-are), and based on affidavits submitted by the candidates themselves (apparently a Supreme Court declaration that makes it mandatory). This means the actual number of cases could be different from those declared.