There's a bellingcat article that's been submitted at least 15 times in the last 3 hours, going Dead each time. It's titled "US Soldiers Expose Nuclear Weapons Secrets Via Flashcard Apps"[0] and seems totally within HN's interest area. Also, other articles from the same site seem to have survived.

Is it a glitch? A new-ish ban? Keyword filtering to avoid getting on a list? Zealous users flagging the links?

[0] https://www.bellingcat.com/news/2021/05/28/us-soldiers-expose-nuclear-weapons-secrets-via-flashcard-apps/

ETA: someone vouched for the most recent posting at the time, https://news.ycombinator.com/item?id=27317946 , but it's still strange how we got to 15 dead entries in 3 hours.