I just don't see how a grinchy investor squeezing a company for more layoffs counts as a story about which there is anything surprising. HN has had hundreds of posts and many major discussions (surely dozens by now) about layoffs at tech companies. Once a topic has gotten that level of coverage, follow-up posts need to contain significant new information* in order to count as on topic. This is just standard HN moderation.
If this investor actually got Google to lay off a bunch more people and there was evidence showing this, I suppose that might be interesting... maybe. But sending a letter? How is that a significant story?
* https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...