The question Confusion of central limit theory was asked recently. After I gave my answer, OP changed his/her question in a way that essentially makes my answer completely useless. In such situation, shall I delete my answer?
As a rule a question should not be a moving target, and to alter it in such a way as to render existing answers wrong or even just incomplete is discouraged. It is alright to rollback such edits and to ask OP to ask a new question.
However, one should also strive to answer questions in the spirit in which they are asked, asking for clarifications first if needed.
I do not oversee all the details of the particular situation, but it appears that there was a poorly stated question and competing interpretations. By now the question is cleaned up and there is a satisfactory answer for OP.
In this case, yes, I think it could make sense to delete your answer. If you think there is lasting value in your answer, you could also add something to clarify its status and leave it around. Something like: "This answer refers to the original version of the question, and is intended to clarify some confusions."