This is similar to what was practiced in Navarodok. Each member of a mussar chaburah in turn whould would be subject to the criticisms of their midos by the other members (in America we call these “lemon sessions”). In Communist China. People were encouraged publicly critise themselves ala a 12 step program.
It is important for all of us to know what we are doing wrong and, sometimes, it takes another to point those things out to us but public self-flagilation as proposed by the original poster is unseemly and often has the oposite of the desired effect.