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It seems to me like a significant discovery for the researcher.A researcher not being aware of something openly used for centuries and already covered in relevant studies, research literature, symposiums (and even popular articles) well before they learn about it, does not quality them made aware of it as being a "discovery".
That's not how the term "discovery" works in an academic context, and certainly it's not what discovery as implied in the article means.
>People are preoccupied with alleviating illiteracy in Africa, it's interesting that these illiteracy figures may be inflated, and it makes me wonder what groups are trying to make Africa look more illiterate than it is, and why
The use of Ajami (which doesn't affect the kind of illiteracy people are concerned about, or even is widespread enough to be used as a substitute for it), and wouldn't much affect that concern (which is about people being able to participate in the official languages and writing systems of their country, and beyond that, for people going to school in general, beyond reading and writing).
>It seems at least in part some of the people classified as illiterate like it that way, since the government can't monitor your communications if it refuses to acknowledge they exist.
It's a system that has been used for half a millenium. It's not like it keeps any communication unreadable or even more difficult to read from the government (another incorrect information in the article).
The government just doesn't bother with it in any official capacity, precisely because it's not official. The same way some patois dialects are not part of many place's publicized literature, are not taught in school, are not used in official documents, and so on. Aside from that, anybody who knows the target language and is familiar with the arabic alphabet, can easily read it - which is exactly why it was used by "illiterate" people (meaning illiterate in the official, colonial or otherwise, languages and writing systems of their country).