I don’t believe hearing loss disqualifies someone one bit.
I suppose providing this info when conversing with others on the finer points of audio quality may be a fair self-qualification to one’s assessment of stuff. Perhaps, “I found the high frequency response lacking, but I also have hearing issues, so…”
Something like that may be fair, but these issues really don’t render a person’s assessment “inadmissible,” or whatever, in my opinion.