Hacker News Reader

It's there. There are 3 posts (not tweets anymore) and then there's that one.

Does it require being logged in to see?

Probably - (as of recentlyish) you only get the linked tweet or on profile/home a selection of 'top' or whatever tweets. Or Xs.

Are you logged in? The logged out view I've seen has been wildly varying, sometimes missing months of updates.

You're logged out -- by default for logged out users, account pages will show "top tweets" not "recent tweets"

Twitter doesn't really work at all when logged out. Try logged in or using something like nitter.net