I feel safer already

from here and here

It probably shouldn't come as any great surprise that Twitter's new encrypted DMs are a mess. When you consider everything that's been going on at Twitter for the last several months, and also how difficult it is to get encryption right, it stands to reason that they may not really have the right talent for it anymore.

Not that that helps the users at all. If you're a high risk user you should probably treat Twitter's encrypted DMs as though they're not encrypted. If you aren't a high risk user, then you should probably treat them as if they're giving you a false sense of security.