I feel I discussed this over in my answer to How should we tag questions about space?, but here it goes again. Tags should be used to provide meaningful question grouping. (Also consider Grace Note's answer over here.)
Does separating constructed-language questions specifically from non-constructed-language questions provide a benefit to those looking for questions, whether to learn or to answer?
If, as DonyorM wrote, on this site linguistics and conlang would largely be the same, then again what's the benefit in separating them?
I'm not sure I see any benefit in such a separation, at least not at the moment. We currently have three questions tagged linguistics and nothing tagged "constructed language" or anything like that which I can find with a quick look through the used tags. (If there is such a tag and I'm missing it, please do point it out and I'll revise this...) Questions relating strictly to existing human languages are probably a better fit on the Linguistics SE than on Worldbuilders anyway. (If this site is to have any chance of making it, we need to focus its scope. Just because a topic might relate to worldbuilding doesn't mean this is necessarily the best place to ask about it.)
Also, like Envite pointed out in a comment, I'd suggest we avoid jargon if possible. We had a discussion about this on the Amateur Radio SE as well (besides outright technical terms, amateur radio is fairly jargon-heavy, and much of the jargon is international in nature) and while that site's Meta is not quite as active as ours here, more people felt jargon should be avoided if possible than otherwise. Tags can be named with up to 25 characters; if we need a tag specifically for constructed languages, I would strongly suggest simply calling it constructed-languages because that will be easy to find and understand the meaning of.