The problem is that there’s no such thing as “regular” deafness (same for blindness). It’s a spectrum with several different types.

You can be deaf but still capable of hearing, and you can be blind and still be capable of seeing. Although in a diminished capacity.

In the case of being tone deaf, you struggle to differentiate different pitches.

I can hear, I just hear things more monotone.

I can tell accents and volume levels apart though. Tonal languages are very difficult.