I flagged this. It's the only visibility the troll in question has achieved. All his posts are dead. Only the minority of us with 'show dead' enabled need know anything about it.
HN has value larger than for just for the community of people commenting here. It is also used as a platform for YC companies. YC Founders can even see each others usernames in orange color[1].
A spamming actor could also be testing the limits of the system now for a future attack. Anyway, this is the job an Infosec team usually deals with. Hopefully @dang / HN team has access to people with such skillset.
Why would he want that though, I don't know...