I've been cleaning some stuff up in some old posts -- fixing permalinks and the like -- and I don't know of any way to do that without the update going out over the RSS feed as a new post. Apologies if anything shows up that seems woefully out of date.
"Why?", you might ask. Don't know. It's just the compulsive side of me that wants the outdated links to point to the things that they were supposed to.