I don’t think I’ve been banned, but I did a similar thing. I requested all my data from Reddit, then used that list of comment/post IDs to mass-edit them. I think I’m in the clear because I used the official third party API, with an official “app.” If you used the private API or instrumented this via the browser, that may be why you were banned.
Anyway, if you or someone else wants their full history, Reddit will give it to you via a data export request.
They just sent out a mass email to users yesterday informing us of this, I got it too. I wonder if it wasn’t getting enough attention, or if they wrote this back in June but only just made the article visible.