On 23 October, I asked:
Can I start the Krankenkasse application process before moving to Germany? (currently deleted, moderator tools needed to view)
On 21 November, it received a downvote, reaching score -1. On 24 November, it was deleted by the Community♦ user.
Since then, I have discovered the answer to the question. Despite the downvote and deletion, I believe this question and my answer could be useful to future users. I have voted to undelete the question. If two more users do the same, I can answer my own question (which will prevent automatic redeletion if I'm quick enough). I hope some users may agree that the question can have value for other users.