This question is clearly on-topic on SuperUser, however, I think the types of experts you're looking for are far more likely to be hanging around on Language Learning, so I would be in favor of allowing it.
This is precisely the type of material you're likely to find on certain languge learning blogs and even books (Fluent Forever comes to mind as an example of both).
So while how to use Anki would generally be on-topic on SuperUser, there are aspects of how to use Anki (and other programs), that are specific to language learners ("Are there any free fonts that display all the characters of the IPA distinctively?", "What's the best way to organize Anki decks to study 3 languages simultaneously?", etc).
Similarly, we should probably allow questions about how to use AnkiWeb and Duolingo, even though they might be on-topic on WebApps.
And we should permit questions about how to use AnkiDroid, even though it might be on-topic at Android Enthusaists.
Just because a question is on-topic somewhere else doesn't mean that somewhere else necessarily has the best experts available. And this is one of the (possibly rare) cases where I think language learning experts are more likely to be able to provide the best answers.
There are also questions about Anki on SuperUser which would not be on-topic here. We don't want to become a general Anki support forum. We want to focus on the types of questions where Language Learning experts are the experts with the knowledge needed to answer the question.
Of course, the authoritative way to determine if this question is on-topic is to ask it during the definition phase, and see what kind of reception it receives. :)