Deletion of answers by 20k+ users requires the post be negatively scored. As of right now, the posts you listed are all 0 scored1, thus are not eligible to be voted on for deletion.
Aside: I've proposed that this be slightly modifiedthat this be slightly modified as it's just a nuisance.
Note 1: save this one which I assume happened after you linked to it, as it isn't eligible to be reviewed anymore.