It seems that the limited downvote options are very good at preventing superfluous downvoting, and in my opinion the list of options should be kept as short as possible. Any new option must prove to not be a specific case of an existing option.
It seems that the “Parent Misunderstood GP” use case is not currently represented. For instance, see this comment: https://lobste.rs/s/q5xc5y/no_way_prevent_this_says_only_development#c_3xxqbz
I downvoted it as “incorrect” but really, the facts presented in the comment are correct. It is the premise of the comment that is incorrect, because the commenter seems to have misunderstood GP.