If the memory isn't owned by the OS, that's probably the wrong actor to manage it.
They say that, instead, they used an undocumented API they obviously didn't understand. Why? If you are concerned about using up too much memory, then do something about it
But in addition to this we got a problematic working-set cap which can absolutely destroy performance. That detail needs to be documented (and the rest of the behavior should be as well).
Is the fourth line of the article linked.
When people talk about using undocumented APIs in windows, that means secret APIs, not badly documented APIs. That is the only meaning that fits the accusatory tone of the comment.
Isn't the thing you being fair to the last line of mrguyorama's comment? The one that was blaming the user? The thing you replied to was an argument over the appropriateness of that specific line.
Trying to strengthen an argument by finding a way that a word could technically work, but not with the original implications, isn't very helpful. I'd even argue it hurts clear communication in a situation like this.