Instead of deleting my old comments on Reddit, I modify them to express my disappointment. (Original comment was "hypocrites" which fits perfectly).
Cloudless@kbin.social to 
Reddit Migration@kbin.social – 48 points – 
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Saves me time deleting the account. Great.
It ensures your account is deleted and not restored, amazing!
This part seems to be true, nothing of mine is getting restored. From a happily permabanned ex-redditor.
From someone who was actually permabanned - I can still log into my account, view my messages and history, old posts, old comments. I can even edit and delete, subscribe to new subreddits and unsubscribe. Basically, I'm just in a readonly mode - no new posts or comments, and no messaging.
Even being permabanned doesn't delete your content on reddit. Though I've argued in the past that this was a good thing - unlike that guy who lost everything when google closed his account (cite is https://www.nytimes.com/2022/08/21/technology/google-surveillance-toddler-photo.html ) you can still go back and save everything if you're in reddit.
But it also means that you have to go through the same trouble as everyone else when you want to erase your content, even if you are permabanned. And you still have to actually delete your account afterwards.
And remember, deleting the account itself prematurely is bad. You want to delete/overwrite everything first and then delete the account. Else, the content is disassociated from you and you have no way to overwrite or delete it afterwards.