Since I hammer-closed the question, and I added the comment, let me explain the reasoning I had, starting with a hypothetical case:
Hypothetically, someone asks a question: "this is my code, it works..."...
I then answer that question with: "Your code is very procedural and it would be much better if it was object-oriented"
That would make for a decent code-review question/answer.
If the OP then asks: "Can you make it object-oriented for me?" then it is no longer a code-review, but a "gimme-the-code" question.
In this case, the same thing has happened, except the OP has done a self-review.... they have looked at their code, and their code's performance, and identified an issue: "If this code was vectorized, it would be more efficient!". They are now asking: "Please vectorize my code".
The question is not asking for a review. It is asking for code, and in my opinion, it is off-topic.
Now, having said that, if they successfully vectorized the code, we would be on-topic to review that working code too.
Vectorization in general
I don't consider the tag to be off-topic in general. I think applying the tag to code containing vectorized operations to be a good thing.
I think the statement that the current vectorization tag is misleading, is overstating the problem. The current tag is:
Vectorization refers to a programming paradigm where functions operate on whole arrays in one go. This affords benefits in terms of function calls, memory access, parallelization and code expressiveness. Some programming languages, such as MATLAB, are optimised to give the best performance when vectorized.
I find that tag info to be clear, and accurately represent what vectorization is. Similar terms are "Object Orientation", "Recursion", etc.
The concern that the tag implies that people can ask to have their non-vectorized code to be converted to vectorized code is unfounded. That would be similar to worrying that people who tag their question with linked-list want their code converted to use linked lists.
Having said that, a scan of recent questions tagged with vectorization shows that many questions are incorrectly tagged. A good example is:
Find the minimum value that data could have had before it was rounded which I feel should be untagged (and currently has 4 close-votes - probably because of kick-back from this meta post). Note that the answer reviews the actual code and recommends recursion and not vectorization.... This is a good example of a mis-tagged question.
Just because people don't read the tag wiki does not make the tag bad. This is simply a case of un-tagging the tag from questions that don't require it.
I have edited the tag to add the text:
Use this tag if your code contains vectorized operations