RESULT : it doesn’t work. not possible to comment to a “deleted” post. yet it is confusing because the interface lets the user write a comment since the commenting box is not grey(ed)_out But as soon as hitting the post_button then it is grey(ed)_out and we get the spiral of death.

Proposed test :
Post "removed by moderator" allows to comment there ... (to be re-tested) But it is impossible to comment if it was locked ... 🤔