Yeah, I think he's said in the past how he clears everything with his lawyer before even releasing the podcast
I don't think it was ever posted honestly, just the notes.
I found it interesting how he didn't mention MySudo here, unless I missed it. Guess there were no changes to what he's already recommended.
I know this isn't an answer but unless I'm using an end-to-end encrypted service like Element or Signal to communicate, I'm assuming anything I write in a DM will become public at some time. Given that, if it is something some sensitive, I will make sure to use one of those instead of the in-house DM.
A workaround is to add old.
in front of the URL and you will still be able to use it, i.e., https://old.reddit.com/r/kbinmigration)
Even if not, it was a good lesson all the same. I forgot to back up 304 so I've learned my lesson and now am going to have to try and track it down.