The general question:
I think questions that are about statistical terminology (the correct use of statistical jargon) are on-topic.
If someone asks about "what does significance really mean in statistics?" then that's right on topic here, in my book. [If they ask about, say, the meaning of the word "linear", that's strictly a mathematics question but should probably be tolerated here because a complete answer relevant to statistics would highlight the use of the constant term (I think
homogeneous coordinates may be the term for that) in linear models, which an ordinary mathematician's explanation might not bother to mention, but will be central to most statistics usage. Some judgement is required as to the degree of relevance.]
However, some questions ask about words or phrases that are just about ordinary English usage. They belong on english.SE (generally not ELL, unless it's clearly something that would be understood by an ordinary user of English).
The somewhat more specific question, and the issue that it raises:
There was a recent question about the statistical meaning of
I believe the premise of the question is false -- there's no particular technical meaning of "versus" in statistics -- in statistical writing it's being used in its ordinary English sense (or, perhaps arguably, in some situations its ordinary mathematical sense), though sometimes subject to fairly ordinary English mistakes, or sometimes common habits in particular areas; that it might be used or misused in a specific way doesn't alter that it's English usage rather than a technical term (or at least not a stats one). The mention of this premise means the question falls in neither of the situations I mention.
Because the question carries the premise that it's a technical term (whether right or not), english.SE shouldn't accept it (they're not in a position to judge whether it's a technical term in stats), so it shouldn't be migrated by us. There may be some argument it really belongs on math.SE but I wouldn't lean that way myself.
So -- assuming it's decided that the premise is mistaken, which is certainly open to some debate -- the question then is 'does a question about a mistakenly-supposed technical term remain open here?'
Here's why I think that's a matter of judgement.
If the impression that the word is statistical jargon with a specialized meaning is very uncommon -- something idiosyncratic to the OP or their experience made them post -- then the question is unlikely to help other users who come here, and should probably close as off topic (preferably with a comment that it takes its plain English meaning so the poster understands where to ask further questions about the usage of the word absent the premise).
However, if it's something people might come to the same conclusion about then it should remain open here, and be answered. In addition, where there's uncertainty, the impulse should lean toward erring on the OP's side (i.e. interpreting the question somewhat generously).
I lean toward saying that the default position should be that such a question should remain open here, but case by case decisions would be needed. It's certainly one I'd prefer not to use my diamond on*, unless I was adding a fifth vote.
* (I wish I could take that diamond off and just vote as an ordinary user in such cases)
[In the particular case of "versus", I think Nick's answer in particular makes the question clearly belong here.]