I think it has been confirmed by the courts that linking is not a form of copyright infringement and therefore legal. Asking people not to do so is at best going to those create a lot of anger from who don't want the Internet to devolve into proprietary walled gardens of content, and at worst is basically asking to be Steisanded.

There have been some funny attempts at trying to stop others from linking to one's site, e.g. by jwz. Then again, this person does use Twitter...

Even if they did, it's futile. They can request mods to ban that account from being submitted, but otherwise there will always be someone who doesn't know about the request, and the threads are great tech content so they will surely be upvoted.

Do we need to ask this question every time? Do we need to derail the comments with the meta discussion about this person, every single time?

Really. Who cares. If you don't want people to link your tweets, why post them to Twitter in the first place?

They should delete them and put them on a blog and block HN traffic like what petulant characters such as jwz has done. Even then one can still screenshot and upload the whole page and paste the link here and they will still get upset over it.

In general, do what you want with the links you post here as long as they don't break the guidelines.