Yes, I know, we have this question: How can I delete my account?
But it's not clear.
Old SOru discussion: Когда аккаунт удаляется с сохранением голосов?. A user with high reputation score was deleted, and all their votes were invalidated.
Recently our member with 15k+ reputation was deleted and his votes were invalidated. So, did Stack Exchange staff decide, that 15k is not a high reputation score? Or something else?
How many reputation points exactly should a deleted user have to prevent vote invalidation?