Real talk, if someone else did actually want to upload this again after it failed for being a self-upload, wouldn't that post get flagged for being a duplicate (of a deleted post)?
Danbooru's policy has long been that we do not flag posts for being duplicates. The post flagging screen makes it abundantly clear that this isn't a valid flag reason.
That said, if an post doesn't get approved by the mods, any re-uploads are even less likely to be approved, and people who try repeatedly uploading the same thing (usually with minor edits to bypass the MD5 checker) tend to get banned.