I’m not sure it is a PC term. There are degrees of hearing impairment from slight impairments that might require no intervention or help to a “hearing impairment” that might require some type of hearing aid, the kind of hearing impairment that can happen as people age, or have some injury to an impairment resulting in pretty much complete deafness. I’ve always thought the term as something that defines a category of impairment. My father wasn’t deaf. But he needed hearing aids. He was hearing impaired, or “hard of hearing” as they used to say.