Umm, permission granted? You've always been allowed to bump your own threads as far as I know, so long as it's been a reasonable time since the last bump.
You're not allowed to necro other people's threads if they've been dead for a long time, like a few months. Maybe you got the impression from that?
Also, you're supposed to edit posts when you want to revise something you've said, rather than double posting.
But bumping has always been allowed as far as I know.