The HN guidelines [0] say titles shouldn't be changed from the original source except in specific circumstances. The word 'Censorship' doesn't appear anywhere in the Guardian article.

[0] https://news.ycombinator.com/newsguidelines.html

It is censorship, and it's one of the reasons companies shouldn't be allowed to filter content.

The other being that if it doesn't directly touch their interests, they will go for the cheapest filtering solution and eliminate anything that could offend any pressure group.

The word Censorship isn’t in the original. It got added.