Yes, it's still hearing... Some people are totally blind, others have such minimal vision they are "legally blind" despite having some limited eyesight. I think hearing
is the same...many folks are "hard of hearing" but not totally deaf. BTW, I listened to that sample music in the article, showing how a snake might "hear" a song....that made it very clear. If you skipped over that part, do check it out.
A couple days ago I watched an old W.C.Fields movie- a old man who was "hard of hearing" came into his store & proceeded to cause havoc. He could still hear
W.C. but only when an "ear trumpet" was used. Most people would have just called him deaf, even though he could still hear a little.