Since tex.se.com has been launched does that mean
latex is off topic on stackoverflow.com?
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It depends on the question.
If the question can legitimately belong to one site (say it is a latex programming question), then it is not off-topic and can remain on it, even if there is a more specialized site for the question.
If, however, it is about some aspect that is not covered by a site (say the question is about typography in tex, asked on Stack Overflow), it is off-topic by nature and should be migrated.