I just skimmed the article as I am marginally familiar with this topic. Back in the middle 90's a friend had a cochleae implant. The lady's hearing had degenerated for genetic reasons. Being aware of this she had learned sign language and her daughters were also learning it as it was likely that both would also loose their hearing. I don't know whether the children continued with sign after their mother got the implant. Clearly a different situation as these are all people who could hear at one point.
One of the things I read at the time was Oliver Sachs' "Seeing Voices" (https://en.wikipedia.org/wiki/Seeing_Voices
) which looks at the coexistence of deaf and hearing people in a "bi-lingual" community in the US. One little anecdote illustrated the "bilingualism" there: one hearing interviewee was asked about another resident there. It took him sometime to recall whether the person in question was deaf or not. The point being that the communication via sign was so fluent that people did not really pay attention to the language they were speaking.
The trend towards implants, totally understandable for people who loose hearing, is in essence a nail in the coffin of yet another set of languages, a loss of another way of expressing oneself.
One minor thing that I learned back then was to trim my moustache - for anyone who reads lips (like my friend) it is important to remember to make sure that you lips are clearly visible.
Bone head-set to moustache trimming … Quite a diversion.