The interesting takeaway is that this means the mastodon migration is having a notable enough effect that Twitter is now blocking it.

Do I have to be logged in to see threads now? I can only see the first tweet that ends in “Long thread emoji”

Remove the trackers (everything behind ? in the link) and you will see the thread. I was logged in but couldn't see the thread until I removed the tracker.

For some reason his replies aren't at the top, you have to expand past the first few replies.