How badly is Twitter's codebase failing?

When Mar Hicks ( who is a great follow and is here at @histoftech ) tweeted behind a locked account about how badly twitter's code base was failing, twitter's code base failed and when another user shared the URL it was visible to the world—a huge security failure. Moreover their account shows up as private or public depending on the app you use to view the account.

(Link to the article that they were sharing: https://www.technologyreview.com/2022/11/08/1062886/heres-how-a-twitter-engineer-says-it-will-break-in-the-coming-weeks/ )