Or, for example here, I've flagged one comment and I think I wrote something like "all obsolete", to address all of the comments, yet only the second one was deleted, which now looks weird :P
That's fine to do. Usually we do check and blast away the comments if you point out they're obsolete. Sometimes we just miss them and delete the flagged comment since it's quicker from the mod tools. Purged all from your recent example.