In the list of reasons for closing a question for being off-topic, there was one along the lines of "This question is not about signal processing as defined in the help center".
I don't see that option any more -- was it removed intentionally?
That was probably me! I'm not sure what happened. I saw that the "default" off-topic reason was duplicated in the custom reasons. So I deleted the custom reason, and tried to enable another one (about homework, which we seem to be getting a few of).
But when I go to that mod page now, ALL the custom reasons have been deleted.
The odd things is, the reasons you're asking about is still there as the default.