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.
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.
https://news.ycombinator.com/item?id=39903345
https://news.ycombinator.com/item?id=39909845
https://news.ycombinator.com/item?id=39912226