Does this mean ex can't include my SS retirement for her spousal support, giving up rights to it, per this MSA?

I am 70, paying spousal support since 2009 and now trying for reduction. I understand that Social Security is included for income calculation. However, my Marriage Settlement Agreement (MSA) includes, in its article 19 the following "according to this state of the law, each party waives and quitclaims any right to claim an interest in the Social Security benefits to be received by the other.