There’s some good discussion about this question here as well: https://plus.google.com/101629211371073711149/posts/GNS9YkQ5xEz
The term ‘deaf’ covers a wide range of hearing impairments – it doesn’t refer only to complete and total silence. The woman who posted the video added in the comments that she’s worn hearing aids since she was 2 years old, but that they can only do so much, and she has always depended heavily on lip-reading.
My guess is that she’s overwhelmed by how CLEAR everything is after a lifetime of struggling to decipher AM-radio static.
THAT WAS NOT THE NINE INCH NAILS CLIP I WAS HOPING FOR.