How to delete an old Closed Question that is spread across two sites?

Question

Inexpensive beach locations to learn surfing as a newbie? [closed more than a year ago] is both on TSE and The Great Outdoors, with the latter seemingly having rejected migration there.

How might one, with enough reputation, vote to delete this?

Answer 1

Meta Stack Exchange notes:

How can a post be deleted?

By a user:

1. You can typically delete your own posts at will; for exceptions, see When can’t I delete my own post? below. To delete a post, just use the delete link below it.

2. Moderators can delete any post instantly.

3. Users with reputation ≥ 2k (more precisely, the edit privilege; 1k on beta sites) can cause automatic deletion of a post if they choose recommend deletion from within the low-quality review queue.

4. Users with reputation ≥ 10k (more precisely, the moderator-tools privilege; 2k on beta sites) can vote to delete questions that have been closed/on-hold for 48 hours. It takes three votes to delete; more if the question is popular, but ten votes at most.

5. Users with reputation ≥ 20k (more precisely, the trusted-user privilege; 4k on beta sites) are not subject to the 48-hour waiting period for deleting closed questions with a score of −3 or lower. They may also delete answers of score −1 or lower. It takes three votes to delete an answer.

(All emphasis and links present in the original.)

Number 1 does not apply. Number 3 only applies to answers. Numbers 2, 4 and 5 are valid, however. Thus:

• it either takes a moderator agreeing with you that the question should be deleted; or
• a certain number of users with more than 10 krep need to agree with you.

For the latter, there should be a little delete link in line with share, edit, reopen, etc.

Another answer explains the number of deletion votes required for ‘popular’ questions:

The new rules (also apply to undelete votes):

• 10k rep users get 5 deletion votes per day on questions they don't own - deletion rules on questions one does own are still in effect.
• Popular questions require more deletion votes to be deleted, at a ratio of 20:1 - a question's popularity is defined as: question score + top-scored answer score. For example, a question with (question score 15 + top answer score 5 = 20) will require 4 deletion votes (3 base votes + 1 popularity vote).
• The maximum number of delete votes needed will not exceed 10.

Note that the above rules apply only to questions; answers take 3 votes, regardless of score.

The question in question (pun intended) has a score of +6 and one answer with a score of +1. Since 6 + 1 < 20, three deletion votes from the community with more than 10 krep should remove it.

Answer 2

Somewhat to my surprise, the post in question was automatically deleted with a note as below:

deleted by Community♦ Dec 10 at 1:01 (RemoveRejectedMigrations)

This question was automatically deleted. Please see the help center for more information.

I take it the year was 2016, though the post was dated 2015.

Answer 3

It is my understanding that posts with an answer are not automatically deleted.

This post has upvotes and an answer, so while closed, it remains for posterity.