Why does the new review page sometimes show "Recommend Deletion," instead of "Delete"?

Question

I notice that when I review low quality posts, I sometimes have a "Recommend Deletion" button, instead of the usual "Delete" one. For example, it happens in the following cases:

• https://meta.stackoverflow.com/community/low-quality-posts/257
• https://meta.stackoverflow.com/community/low-quality-posts/218
• https://meta.stackoverflow.com/community/low-quality-posts/126
• https://meta.stackoverflow.com/community/low-quality-posts/78
• https://meta.stackoverflow.com/community/low-quality-posts/236
• https://meta.stackoverflow.com/community/low-quality-posts/11
• https://meta.stackoverflow.com/community/low-quality-posts/232
• https://meta.stackoverflow.com/community/low-quality-posts/152
• https://meta.stackoverflow.com/community/low-quality-posts/212
• https://meta.stackoverflow.com/community/low-quality-posts/185

Those are consecutive posts I reviewed, and for which I didn't see the "Delete" button as I was expecting.

What is the difference?

Answer 1

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 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.}