When users come across their own question that was automatically deleted, they are given a link to the help page on what criteria cause a question to be deleted by the Community user. However, that page is rather matter-of-fact, just explaining the criteria for automatic deletion. That page doesn't have any reasons why the criteria are what they are, and how to go about getting it undeleted if they want.
This seems rather not nice to a user who might still want an answer to their old question that was automatically deleted for inactivity, or one that they want to self-answer. It also makes users less likely to ask questions about obscure topics, since those are often left unanswered and un-voted, and they may simply not ask them because they know it may be deleted after a year.
I suggest adding in, for each deletion reason, a brief explanation as to why that criterion exists. Then, at the bottom, adding in a brief paragraph on how to get your question undeleted, and also the fact that if, after it's undeleted, it hasn't been fixed so that the deletion criteria no longer apply, it will be immediately re-deleted.