We should fix the typo
If the querent thinks that an error in their question is a typo, then by definition that error is irrelevant to the meaning of the question and makes the question less clear.
We should remove the typo from the question so that:
- Anyone who reads the question in the future will benefit from the extra clarity, if ever so slightly.
- Anyone who answers the question in the future won't waste their time addressing a typo.
Ideally, the typo should have been noticed through comments, instead it was noticed through a tangent in an answer. However, the utility of that tangent is no less transient than any other comment: now that we recognize the typo for what it is, that tangent no longer serves a purpose. Because the tangent no longer servers a purpose, the answer would be better without it.
If the typo happens to be a genuine question in the eyes of someone other than the querent, then that person should ask that question in a separate Q&A.