According to the laws of mandated reporting, if a person works in a day hab program for special needs adults, and discourages them from engaging in inappropriate relationships or the like, one who observes this must report the employee, as this is illegal infringement on liberty. The same would apply to voicing opinions about to’eva relationships.
I’ve worked in such settings and have seen the documents one must sign.
To say that one must always report whatever a mandated reporter is charged with telling sounds to me like whichever rabbonim concluded such were/are misinformed.