http://lsolum.typepad.com/legal_theory_lexicon/2003/09/legal...
this article is about recommendations of what to do ex post once a comment-less line of code has been committed in the past that you need to understand. arguments about ex ante things such as how it got there in the first place and how to prevent it from happening is completely orthogonal to the point of the article.
https://github.com/madrobby/zepto/commit/3d92f20966aa02dee82...
Which means the OP genuinely thinks that commits like this one are good practice, and the purpose of the article is to show how to deal with it.
Yet as it was argued above, commits like that should never happen in the first place.
Notice the code comment. I took it out for the example in the blog post to illustrate how we would deal if there was never a code comment in the first place.