Twitter doesn’t show threads to people who are not logged in (e.g. if you don’t have an account). Shaming people for not reading what they can’t see (or even know exists) is unfair. Using archival sites doesn’t work as a bypass like on newspaper sites.
Not to mention people on Firefox, which from what I have read on HN might not even have access to it at all.
Twitter links should probably be downranked on HN until (if/when) they return to being more accessible.