I just tried and I could read that whole thread without being logged in. Maybe twitter lets you read the whole thing if you've ever logged in with that browser?
I guess if this is actually a problem, anyone who's bothered by it, who doesn't have a twitter login could look into rewriting twitter.com links to nitter.net instead.
If you scroll a little too far at the end, it'll lock you out and prompt you to login. Basically as soon as the first "recommended" tweet is displayed mid-screen.
The way I scroll as I read, I often have to go back and reload the page just to read the last tweet in a thread.
