I did the same, but, it seems reddit has some capability to restore posts anyway, as I keep finding original posts of mine via google while my logged in profile remains blank...

It's to the point where I search for them every few weeks and take time to edit and delete them manually, after which they seem to stay gone.

My best guess is that they can detect mass deletion and have some sort of automation that restores posts at (seemingly ) random. Either that or their platform is broken enough that editing or deleting posts isn't reliably committed to disk.

I had tried manually delete post/comments before shreddit, half of the deleted post/comments returned after refreshing the page. Checking the requests, many of them would return 500 status code.

Later move to shreddit and created a cronjob to delete the entries, and kept shreddit running a week or so. As you suggested, you will hit Reddit's rate limit soon after start mass deleting or your account shadow-banned.

Just checked two of my deleted account, can't see any post or comment. I wish I didn't delete it, just overwrite them with random sentences from local AI

Hacker News users love to act like they are the most intelligent people on the internet but in reality they have no idea what they are talking about if it isn't about some obscure programming language.

There is no conspiracy to restore deleted comments lol. You can only retrieve 1000 items with Reddit's API so when you use Shreddit to delete your posts only 1000 are deleted. Everything else before that remains untouched. Use PullPush to really delete everything.

You misunderstand, likely because you were too excited to be snarky.

My reddit profile was empty, I'm aware of the api limitations, I read the readme.md, shreddit ran on a loop for 24 hours, each time pulling 1000 posts, editing, and deleting them. My profile is still empty, and currently my google results are empty, but in another few weeks some will pop up again, but still won't show in my reddit profile.

Clear enough for you?

Leaving it running for 24 hours does nothing lol. Once you make over 1000 comments you cannot access the older comments through the API. If you have made 2000 comments and delete 1000 the older 1000 will not show up on your profile. I have no idea how else to explain this.