As the moderator who added the post notice to a fair portion of the answers . . . I'm going to say yes.
Generally, I'm not a fan of retagging (either adding or removing) the hard-science tag after you've gotten answers to the question, but I do feel that the latter is better than the former, as you're not really invalidating any answers. In this case, most of the answers aren't really hard-science, either, so it's not as if someone wrote a really fantastic answer that deserves a million upvotes whose work has gone for naught. I don't mean to disparage the answers already there - some are good - but there's nothing I would consider an exemplary hard-science answer.
Speaking of which, 6/13 answers currently have the post notice; several others don't have it simply because I didn't see them yet. I do believe that the question can be answered using hard-science - honestly, calculating energy transferred through tidal dissipation is not that hard, and I'm a little disappointed nobody actually did the computations - but I also believe that there's a point at which maybe it's better to accede to mass opinion, which currently seems to be that the tag is not needed, for whatever reason. Some of the ideas are interesting, but don't necessarily admit a hard-science explanation.
For instance, yesterday James (in chat) had an idea involving the gravitational pull on fluids, but he didn't know how to do the calculations (neither did I; my response: "Fluid mechanics? Away with ye!"). You'd have to ask him, but I think he was dissuaded from the tag, and might have posted an answer if he could have dropped the math.
So, though I say it a bit regrettably, yes, I think it might be good to drop the tag from the question. If you do, flag the question for mod attention using the custom flag, and one of us will remove all the post notices.