While surely not the source of the saying, antirez argues in a similar direction:
> You may think that writing comments is a lesser noble form of work. After all you can code! However consider this: code is a set of statement and function calls, or whatever your programming paradigm is. Sometimes such statements do not make much sense, honestly, if the code is not good. Comments require always to have some design process ongoing, and to understand the code you are writing in a deeper sense. On top of that, in order to write good comments, you have to develop your writing skills. The same writing skills will assist you writing emails, documentation, design documents, blog posts, and commit messages.
In any case, you're making a good point, though I would argue that the reverse of the saying (with the modification that "expectations" get replaced with "trust") also holds:
If someone is not able to write intelligible, stringent English, I wouldn't trust them to write good code, either, because writing good code requires similar qualities (good stringent structure, empathizing with the future reader of your code etc.) and, as antirez argues convincingly, it also requires writing comments (which are in plain English).