Instead of deleting my old comments on Reddit, I modify them to express my disappointment. (Original comment was "hypocrites" which fits perfectly).
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Reddit Migration@kbin.social – 48 points – 
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I like it. But you'll have to do this manually for every post right?
I read someone saying that they tried to use automated tools to delete their posts (Shreddit I think) but Reddit was undoing the deletions, or something. So that's annoying if you have to change/delete every post manually.
I think another issue is the timing of when you do your edits/deletes and when a sub privates/unprivates. I noticed yesterday when a couple subs unprivated, my edited/deleted comments and posts came back.
Scripts seem to work still right? They essentially just mimic the process of doing it manually
The Greasemonkey / Tampermonkey scripts just automate the manual editing.
Yeah I'm editing my comments manually so Reddit can't undelete them.
Most of the scripts also edit the posts first because while Reddit can undelete stuff (for now - GDPR might have something to say about that eventually :) ), they don't keep edit history.
The other catch is the 1000 indexing limit. If you kept a record of every post and comment you ever made outside of reddit then you're fine. But if you have enough comments/posts, then you can't trust your reddit profile to know that everything has been edited/deleted.