I wondered if after a long day, I was missing something. What purpose would this serve? As you stated ASL is a totally different thing, and I know some deaf from birth people who are more comfortable with ASL than reading text, as it is actually quicker, and truly is their first language.
Anyone who dons this glove, obviously has the dexterity to type a text, so why wouldn't they? If there is computer equipment available to read the glove, then there should be a way to.display the text. That is all I can see for hearing impaired people.
If the market is for sightless people to type a text, voice recognition works, and if you have it read the text back to you, so you can edit, it is almost 100% accurate.
The last thing I see, is that they just wanted to see if they could,but sensing your hand, and finger position in space does not seem like a major breakthrough, technology wise.
Reading more into it, this was not invented for hearing, or sight impaired people. It is just an attempt to make a fairly cheap glove that will sense hand position, and gestures. They mention video games, and things like virtual surgery, so I guess it is just a more stylish Nintendo Power Glove.