Let me try it on my second account now and see. But I just did my porn Reddit account on Monday and worked.
There is an app called redact, you can use it not just delete but also replace all your comments with fuck you u/spez . For your whole account , that’s what I did and it held.
Just ran it now it’s a little slow but connects and goes just fine. Here’s a link if anyone needs it - https://redact.dev