When a question is migrated to another site, and it is then closed on the receiving site, it gets locked. This means the question is not editable, nor is it possible to vote to delete it.
That is what happened with https://meta.stackexchange.com/questions/39550/how-to-make-a-good-valid-post-that-will-not-get-voted-down-by-other-users
The lock also avoids that questions with a negative score, and no answer are automatically deleted from the script that runs once per week.
What is the reason for locking such questions? What is the lock trying to accomplish?