If somebody from a disadvantaged group is hired based on having sufficient skill, talent and/or experience for a given job, then affirmative action was not involved. The person was hired based on merit.
But if affirmative action is used to justify the hiring of somebody, it inherently means that they did not have the sufficient skill, talent, and/or experience necessary for the job. The person was hired not based on merit, but based on some other, unrelated factor.
Hiring based on something other than merit automatically means that standards were lowered, or at best they were merely ignored.